function validateForm(form)
{

if( notValidEmail( form.Email ) ){
        alert( 'You have not entered a valid Email' );
		document.forms.form.Email.focus();
        return false;}
		

function notValidEmail( str ){
    mailRE = new RegExp( );
    mailRE.compile( '^[\._a-z0-9-]+@[\.a-z0-9-]+[\.]{1}[a-z]{2,4}$', 'gi' );
    return !(mailRE.test( str.value ));
} 
if(""==document.forms.form.ReferenceNumber.value)
{
alert("Please enter your Reference Number.");
document.forms.form.ReferenceNumber.focus();
return false;
}
}