function checkform(objForm) {
	if(objForm.first.value == "") {
		alert("Please enter your first name.");
		objForm.first.focus();
		return false;
	}
	if(objForm.last.value == "") {
		alert("Please enter your last name.");
		objForm.last.focus();
		return false;
	}	
	if(objForm.email.value == "") {
		alert("Please enter your email address.");
		objForm.email.focus();
		return false;
	}		
	if(!isEmail(objForm.email.value)) {
		alert("Please enter a valid email address.");
		objForm.email.value = "";
		objForm.email.focus();
		return false;
	}	
	return true;
}