function val_contact() {
mNv=mainform.name.value;
if (mNv=='') {
alert('Your name is a required field. Please try again.');
event.returnValue=false;
}
mEv=mainform.email.value;
if (mEv=='') {
alert('Your email is a required field. Please try again.');
event.returnValue=false;
}
mCv=mainform.comment.value;
if (mCv=='') {
alert('Your comment is a required field. Please try again.');
event.returnValue=false;
}}