function disableEnterKey(e)
{
    
     var key;      
     if(window.event)
          key = window.event.keyCode; //IE
     else
          key = e.which; //firefox      
     return (key != 13);
}

    function Validate()
    {
    
        if (document.getElementById("tbFirstName").value == '')
	    {
		    document.getElementById("tbFirstName").focus();
		    alert ("Please enter First name.")
		    return false;
	    }

	    if (document.getElementById("tbLastName").value == '')
	    {
		    document.getElementById("tbLastName").focus();
		    alert ("Please enter Last name.")
		    return false;
	    }
	    
	   if (document.getElementById("tbParentName").value == '')
	    {
		    document.getElementById("tbParentName").focus();
		    alert ("Please enter Parent name.")
		    return false;
	    }
	
	    if (document.getElementById("tbAge").value== '')
	    {
		    document.getElementById("tbAge").focus();
		    alert ("Please enter Age.")
		    return false;
	    }
	    if (isNaN(document.getElementById("tbAge").value))
	    {
		    document.getElementById("tbAge").focus();
		    alert ("Please enter valid Age.")
		    return false;
	    }
	  
	
	    if (document.getElementById("ddlCountry").selectedIndex <= 0)
	    {
		    document.getElementById("ddlCountry").focus();
		    alert ("Please select the country.")
		    return false;
	    }
    	
	    if ((document.getElementById("tbCountryCode").value == '') || (document.getElementById("tbStateCode").value == '') || (document.getElementById("tbNumber").value == ''))
	    {
		    document.getElementById("tbCountryCode").focus();
		    alert ("Please enter the residence phone no.")
		    return false;
	    }
	    if (document.getElementById("tbMobile").value == '')
	    {
		    document.getElementById("tbMobile").focus();
		    alert ("Please enter the mobile no.")
		    return false;
	    }
	    
	    if (document.getElementById("tbPrimaryEmail").value == '')
	    {
		    document.getElementById("tbPrimaryEmail").focus();
		    alert ("Please enter the primary email id.")
		    return false;
	    }
	
	    var email = document.getElementById("tbPrimaryEmail").value;
	    if (email.length > 0)
	    {
		    if (!(emailval(document.getElementById("tbPrimaryEmail"))))
		    {
			    fdocument.getElementById("tbPrimaryEmail").focus();
			    return false;
		    }
	    }
    	
	    if (document.getElementById("tbSecondaryEmail").value != '')
	    {
		    var email = document.getElementById("tbSecondaryEmail").value;
		    if (email.length > 0)
		    {
			    if (!(emailval(document.getElementById("tbSecondaryEmail"))))
			    {
				    ocument.getElementById("tbSecondaryEmail").focus();
				    return false;
			    }
		    }
	    }
	
	    if (document.getElementById("tbSecondaryEmail").value != '')
	    {
		    var email = document.getElementById("tbSecondaryEmail").value;
		    if (email.length > 0)
		    {
			    if (!(emailval(document.getElementById("tbSecondaryEmail"))))
			    {
				    document.getElementById("tbSecondaryEmail").focus();
				    return false;
			    }
		    }
	    }
	

	    if ( ((document.getElementById("ddlMondayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlMondayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlMondayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlMondayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlMondayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }

	    if ( ((document.getElementById("ddlMondayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlMondayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlMondayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlMondayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlMondayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }

        if ( ((document.getElementById("ddlTuesDayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlTuesDayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlTuesDayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlTuesDayMorningTo").selectedIndex > 0)) )
        {
	        document.getElementById("ddlTuesDayMorningFrom").focus();
	        alert ("Please select the time.")
	        return false;
        }
    	

	    if ( ((document.getElementById("ddlTuesdayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlTuesdayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlTuesdayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlTuesdayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlTuesdayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }

	    if ( ((document.getElementById("ddlWednesdayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlWednesdayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlWednesdayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlWednesdayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlWednesdayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	

	    if ( ((document.getElementById("ddlWednesdayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlWednesdayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlWednesdayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlWednesdayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlWednesdayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }

    	
	    if ( ((document.getElementById("ddlThursdayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlThursdayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlThursdayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlThursdayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlThursdayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	

	    if ( ((document.getElementById("ddlThursdayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlThursdayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlThursdayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlThursdayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlThursdayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
    	
	    if ( ((document.getElementById("ddlFridayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlFridayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlFridayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlFridayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlFridayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
    	
	    if ( ((document.getElementById("ddlFridayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlFridayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlFridayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlFridayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlFridayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
    	
	    if ( ((document.getElementById("ddlSaturdayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlSaturdayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlSaturdayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlSaturdayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlSaturdayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
    	
	    if ( ((document.getElementById("ddlSaturdayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlSaturdayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlSaturdayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlSaturdayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlSaturdayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
    	
	    if ( ((document.getElementById("ddlSundayMorningFrom").selectedIndex > 0) && (document.getElementById("ddlSundayMorningTo").selectedIndex <= 0)) || ((document.getElementById("ddlSundayMorningFrom").selectedIndex <= 0) && (document.getElementById("ddlSundayMorningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlSundayMorningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
    	
	    if ( ((document.getElementById("ddlSundayEveningFrom").selectedIndex > 0) && (document.getElementById("ddlSundayEveningTo").selectedIndex <= 0)) || ((document.getElementById("ddlSundayEveningFrom").selectedIndex <= 0) && (document.getElementById("ddlSundayEveningTo").selectedIndex > 0)) )
	    {
		    document.getElementById("ddlSundayEveningFrom").focus();
		    alert ("Please select the time.")
		    return false;
	    }
	    
      var selectCount=0;
	    for (var i =0; i < document.forms[0].elements.length; i++) 
	    {
	       if (document.forms[0].elements[i].type=="checkbox" && document.forms[0].elements[i].checked==true)
	        selectCount++;
	        
	        if (selectCount>3)
	        {
	            alert("Maximum three courses only can be selected");
	            return false;
	        }
	    }
	    
	    if (selectCount==0)
	    {
	            alert("Atleast one course should be selected");
	            return false;
	    }
}