function validate_field_force()
{
	var mailExp  = /^([_&a-zA-Z0-9-]+(\.[_&a-zA-Z0-9-]+)*@[&a-zA-Z0-9-]+\.+[&a-zA-Z0-9-]+)/;

	
	if(document.fieldForce.firstname.value=="")
	{
		alert("firstname can not be blank");
		document.fieldForce.firstname.focus();
		return false;
	}	
	if(document.fieldForce.email.value=="")
	{
		alert('email can not be blank');
		document.fieldForce.email.focus();
		return false;
	}	
	if(document.fieldForce.email.value !="" && 
		!mailExp.test(document.fieldForce.email.value))
	{
		 alert("please enter valid e-mail");
		 document.fieldForce.email.focus();
		 return false;
	}	
}