function validate_required(field,alerttxt)
{
with (field)
{
if (value==null||value=="")
  {alert(alerttxt);return false;}
else {return true}
}
}

function validate_form(thisform)
{
with (thisform)
{
if (validate_required(name,"Please fill out your first name.")==false)
  {name.focus();return false;}
  else {
	  if (validate_required(email,"Please fill out your email address.")==false)
  {email.focus();return false;}	  
  else {
	  if (validate_required(contactnumber,"Please fill out your contact number.")==false)
  {contactnumber.focus();return false;}
				}
			}
		}
	}