var str
function echeck(str) 
	{
		var at="@"
		var dot="."
		var lat=str.indexOf(at)
		var lstr=str.length
		var ldot=str.indexOf(dot)

		if (lat==-1){
		   alert("Invalid E-mail ID")
		   return false;
		}

		if (lat==-1 || lat==0 || lat==lstr){
		   alert("Invalid E-mail ID")
		   return false;
		}

		if (ldot==-1 || ldot==0 || ldot==lstr){
		    alert("Invalid E-mail ID")
		    return false;
		}

		 if (str.indexOf(at,(lat+1))!=-1){
		    alert("Invalid E-mail ID")
		    return false;
		 }

		 if (str.substring(lat-1,lat)==dot || str.substring(lat+1,lat+2)==dot){
		    alert("Invalid E-mail ID")
		    return false;
		 }

		 if (str.indexOf(dot,(lat+2))==-1){
		    alert("Invalid E-mail ID")
		    return false;
		 }
		
		 if (str.indexOf(" ")!=-1){
		    alert("Invalid E-mail ID")
		    return false;
		 }
 		 return true;					
	}


function check_form()
{
	chfrm = document.register;
	if(chfrm.fname.value=="")
	{
		alert("Please Enter the First Name.");		
		return false;
	}
	else if(chfrm.surname.value=="")
	{
		alert("Please Enter the Surname.");				
		return false;
	}
	else if(chfrm.sex.value=="")
	{
		alert("Please Enter the sex");				
		return false;
	}
	else if(chfrm.date.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(chfrm.date.value))
	{
		alert("Please Enter only numerical values for Date.")
		return false;
	}
	else if(chfrm.month.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(chfrm.month.value))
	{
		alert("Please Enter only numerical values for Month.")
		return false;
	}
	else if(chfrm.year.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(chfrm.year.value))
	{
		alert("Please Enter only numerical values for Year.")
		return false;
	}
	else if(chfrm.birthplace.value=="")
	{
		alert("Please Enter the Place of Birth");				
		return false;
	}
	else if(chfrm.address.value=="")
	{
		alert("Please Enter the Address");				
		return false;
	}
	else if(chfrm.postcode.value=="")
	{
		alert("Please Enter the Postcode");				
		return false;
	}
	else if(chfrm.email.value=="")
	{
		alert("Please Enter the Email Address");				
		return false;
	}
	else if (echeck(chfrm.email.value)==false)
	{
		chfrm.email.focus();
		return false;
	}
	else if(chfrm.phone.value=="")
	{
		alert("Please Enter the Telephone No.");				
		return false;
	}
	else
	{
		return true;
	}
}


function validate_form()
{
	frm = document.pre;
	if(frm.name.value=="")
	{
		alert("Please Enter the Name");
		return false;
	}
	else if(frm.postcode.value=="")
	{
		alert("Please Enter the Postcode");		
		return false;
	}
	else if(frm.date.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(frm.date.value))
	{
		alert("Please Enter only numerical values for Date.")
		return false;
	}
	else if(frm.month.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(frm.month.value))
	{
		alert("Please Enter only numerical values for Month.")
		return false;
	}
	else if(frm.year.value=="")
	{
		alert("Please Enter the valid Date of Birth");				
		return false;
	}
	else if (isNaN(frm.phone.value))
	{
		alert("Please Enter only numerical values for Year.")
		return false;
	}
	else if(frm.email.value=="")
	{
		alert("Please Enter the Email Address");				
		return false;
	}
	else if (echeck(frm.email.value)==false)
	{
		frm.email.focus();
		return false;
	}
	else if(frm.drug.value=="")
	{
		alert("Please Enter the Drug");				
		return false;
	}
	else if(frm.dose.value=="")
	{
		alert("Please Enter the Dose");				
		return false;
	}
	else if(frm.to_collect_from.value=="")
	{
		alert("Please select one option");				
		return false;
	}
	else
	{
		return true;
	}
}