function validate_form () {
    valid = true;
    if( document.contact_form.name.value == "" ) {
    	alert("Enter Your Name");
    	valid = false;
    }
    if( document.contact_form.phone.value == "" ) {
    	alert("Enter Your Phone Number");
    	valid = false;
    }
	if( document.contact_form.subject.value == "" ) {
    	alert("Enter the Subject");
    	valid = false;
    }
    return valid;
}