function validate_form (obj_form) {
	obj_form.first_name.value = trim ( obj_form.first_name.value );
	obj_form.last_name.value = trim ( obj_form.last_name.value );
	obj_form.email.value = trim ( obj_form.email.value );

	if ( obj_form.first_name.value == "" ) {	
		obj_form.first_name.focus ();
		alert ("First name is a required field.");
		return false;
	}
	if ( obj_form.last_name.value == "" ) {	
		obj_form.last_name.focus ();
		alert ("Last name is a required field.");
		return false;
	}
	if(obj_form.email.value=="") {	
		obj_form.email.focus();
		alert("E-mail is a required field.");
		return false;
	}
	if(!isEmail(obj_form.email.value)) {	
		obj_form.email.focus();
		alert("Your e-mail entry was not recognized as valid.");
		return false;
	}
	
	return true;
}