// JScript File

function mail_valid(em,sub,com)
{

var regex = new RegExp("^[0-9a-z\\._]+@[0-9a-z]+\\..+$","i");

if(em.value=="")
{
alert('Email ID should not be empty');
em.focus();
return false;
}
else if(em.value!="" && !(regex.test(em.value)))
{
alert("Invalid email id , please enter the valid email id like(example@exp.com)");
em.focus();
return false;
}

else
if(sub.value=="")
{
alert('Subject should not be empty');
sub.focus();
return false;
}

else
if(com.value=="")
{
alert('Comment should not be empty');
com.focus();
return false;
}
return true;

}