Please help me!!!

<script language="JavaScript" src="jscript/calendar1.js"></script>
 
<!-- validate form script -->
<SCRIPT>
function validate() {
mTraineev=mainform.Trainee.value;
mDatev=mainform.TDate.value;
if (mTraineev=='') {
alert('Your full name is a required field. Please try again.');
event.returnValue=false;
}
if (mDatev=='') {
alert('Your must enter a training date or select it from the calendar.');
event.returnValue=false;
}
if (mainform.Team.options[0].selected) {
alert('Please your faculty/team.');
event.returnValue=false;
}
if (mainform.Training.options[0].selected) {
alert('Please choose one training from the list.');
event.returnValue=false;
}
if (mainform.TTime.options[0].selected) {
alert('Please choose a start time.');
event.returnValue=false;
}
if (mainform.duration.options[0].selected) {
alert('Please choose how long you would like to be trained.');
event.returnValue=false;
}
if (!(mainform.BeforeLevel[0].checked || mainform.BeforeLevel[1].checked || mainform.BeforeLevel[2].checked)) {
alert('You need to choose your level before training.');
event.returnValue=false;
}
}
</SCRIPT>