//validasi kontak form
function submit_form(value) {
		if(value.name.value == "") {
			alert("Please fill in the Name field.");
			value.name.select();
			return false;
		}else if(value.email.value == "") {
			alert("Please complete the email field with valid email address.");
			value.email.select();
			return false;
		}else if((value.email.value.indexOf('@') < 0) || ((value.email.value.charAt(value.email.value.length-4) != '.') && 			(value.email.value.charAt(value.email.value.length-3) != '.'))) 
			{alert("You type wrong email address, please try again.");
			value.email.select();
			return false;
		}else if(value.subject.value == "") {
			alert("Please fill in the Subject field.");
			value.subject.select();
			return false;
		}else if(value.message.value == "") {
			alert("Please fill in your question, comments or suggestions.");
			value.message.select();
			return false;
		}else if(value.verif_box.value == "") {
			alert("You forget to type keycode image.");
			value.verif_box.select();
			return false;
		}
		else {
			return true;
		}
	}