function isEmpty(theField) {
        if (theField.value == "") { return true; } else { return false; }
} 
function isRequired(thisForm) {
        var Empty=false; 
        var errstring=""; 
        if (isEmpty(thisForm.elements.firstName)) {
                errstring += "Your name is required to submit this form.\n"; 
                Empty=true; 
        }
        if (isEmpty(thisForm.elements.lastName)) {
                errstring += "Your comments required to submit this form.\n"; 
                Empty=true; 
        }
		if (isEmpty(thisForm.elements.email) ) {
                errstring += "Your email is required to submit this form.\n"; 
                Empty=true; 
        }
				
        if (Empty==true){
                alert("Problems:\n"+errstring); 
                 return false; 
        } else { return true; } 
}