function checkbae(obName){
var em = obName;
if (checkemail(obName) == false) {
em.select();
alert("This email address is an invalid format. Please try again.");
em.focus();
return false;
}
else {
return true;
   }
}

function checkemail(obName){
var em = obName;
var str=em.value;
if (str==""){
return true;
}
var filter=/^([\w-]+(?:\.[\w-]+)*)@((?:[\w-]+\.)*\w[\w-]{0,66})\.([a-z]{2,6}(?:\.[a-z]{2})?)$/i;
if (filter.test(str)){
return true;
}
else {
return false;
}
}