function validateForm()
{
	var error = 0;
			if(""==document.forms.contact.name.value) { 
				show("error_name");
				error = 1;
			} else {
				hide("error_name");
			}
			if(""==document.forms.contact.phone.value) { 
				show("error_phone");
				error = 1;
			} else {
				hide("error_phone");
			}
			if(""==document.forms.contact.questions_and_comments.value) { 
				show("error_questions_and_comments");
				error = 1;
			} else {
				hide("error_questions_and_comments");
			}
	
	if(error == 1) {
		return false;
	}
}