function validate_email(field)
{
with (field)
  {
  apos=value.indexOf("@");
  dotpos=value.lastIndexOf(".");
  if (apos<1||dotpos-apos<2)
    {return false;}
  else {return true;}
  }
}


function validateForm(tf){
var msg="";
var varfocus="";
var retVal=true;
		
	if (tf.FirstName.value==null||tf.FirstName.value==""){
		msg = msg + 'First name is required.\n\n';
		varfocus = "FirstName";
		retVal=false;
	}
						
	if (tf.LastName.value==null||tf.LastName.value==""){
		msg = msg + 'Last name is required.\n\n';
		if(!varfocus) varfocus = "LastName";
		retVal=false;
	}
	
	if (tf.Email.value==null||tf.Email.value==""){
		msg = msg + 'Email Address is required.\n\n';
		if(!varfocus) varfocus = "Email";
		retVal=false;		
	}	
		
	else if (validate_email(tf.Email)==false){
		msg = msg + 'Invalid Email Address!\n\n';
		if(!varfocus) varfocus = "Email";
		retVal=false;		
	}		
							
						
	if (tf.Zip.value==null||tf.Zip.value==""){
		msg = msg + 'Postal Code is required.\n\n';
		if(!varfocus) varfocus = "Zip";
		retVal=false;		
	}						
					
						
	if(retVal) {
		tf.submit();
	} else {
		alert(msg);
		eval("tf."+varfocus+".focus();");
		return retVal;
	}
}