// JavaScript Document


function checkform() {

var error1 = "Please enter a first name.\n"
var error2 = "Please enter a last name.\n"
var error3 = "Please enter a valid email address.\n"
var error4 = "The entered email address contains illegal characters.\n"

if(document.thisForm.first_name.value == "")	{
	alert (error1);
	return false;
}

if(document.thisForm.last_name.value == "") {
	alert (error2);
	return false;
}

var emailFilter=/^.+@.+\..{2,3}$/;
if (!(emailFilter.test(document.thisForm.email.value))) { 
    alert (error3);
	return false;
}

var illegalChars= /[\(\)\<\>\,\;\:\\\/\"\[\]]/
if (document.thisForm.email.value.match(illegalChars)) {
   alert (error4);
   return false;

}

return true;
 }