//validasi kontak form
function submit_form(value) {
		if(value.txtcompany.value == "") {
			alert("Please fill in the company field.");
			value.txtcompany.select();
			return false;
		}
		if(value.txtnama.value == "") {
			alert("Please fill in the name field.");
			value.txtnama.select();
			return false;
		}
		else if(value.txtemail.value == "") {
			alert("Please complete the email field with valid email address.");
			value.txtemail.select();
			return false;
		}
		else if((value.txtemail.value.indexOf('@') < 0) || ((value.txtemail.value.charAt(value.txtemail.value.length-4) != '.') && 			(value.txtemail.value.charAt(value.txtemail.value.length-3) != '.'))) 
			{alert("You type wrong email address, please try again.");
			value.txtemail.select();
			return false;
		}else if(value.txtproject.value == "") {
			alert("Please fill in your project description.");
			value.txtproject.select();
			return false;
		}
		else {
			return true;
		}
	}