var col;
var coloud = "nix";
var srt = "ASC";
function ajax(url,id) {																										
	col=url;
	if( id=="inhoud" ){
		if(coloud==col){
			if(srt=="ASC"){srt="DESC";} else {srt="ASC";}
			url = "sorteren.php?selecteer="+col+"&volgorde="+srt;	
			coloud = col;	
		}
		else {
			srt = "ASC";
			url = "sorteren.php?selecteer="+col+"&volgorde="+srt;	
			coloud = col;
		}
	}

	var httpObj = false;																											
		httpObj = window.XMLHttpRequest ? new window.XMLHttpRequest : (window.ActiveXObject ? new ActiveXObject("MSXML2.XMLHTTP"): null);
		httpObj.onreadystatechange = function() {																		
		if (httpObj.readyState == 4) {
			if(id=="email"){
				document.getElementById("imgemail").style.visibility=httpObj.responseText;
				formCheck("email");
			}
			else {
				document.getElementById(id).innerHTML = httpObj.responseText;
			}
			return;																											
		}																														
	};																															
	httpObj.open('POST', url, true);																					
	httpObj.send(null);																										
}

var active;
active = "omschr";
function roll(num,id) {
	if (active != id) {
		if (num == 1) {
			document.getElementById(id).className = "tabOver";
		}
		if (num == 2) {
			document.getElementById(id).className = "tab";
		}
		if (num == 3) {
			document.getElementById(active).className = "tab";
			document.getElementById(id).className = "tabActive";
			active = id;
		}
	}
}

function checkform(id) {
	inpNaam 		= document.getElementById("naam").value;
	inpAdres 		= document.getElementById("adres").value;
	inpPcenp 		= document.getElementById("pcenp").value;
	inpEmail 		= document.getElementById("email").value;
	inpTel	 		= document.getElementById("tel").value;	
	inpOpmerking	= document.getElementById("opmerking").value;
	inpHuis			= document.getElementById("huis").value;
	inpPlaatss		= document.getElementById("plaatss").value;		
	ajax('formulier.php?inpNaam='+inpNaam+'&inpAdres='+inpAdres+'&inpPcenp='+inpPcenp+'&inpEmail='+inpEmail+'&inpTel='+inpTel+'&inpOpmerking='+inpOpmerking+'&inpHuis='+inpHuis+'&inpPlaatss='+inpPlaatss+'&submit=Verstuur',id);
}

function formCheck(id){
	if(id!="email"){
		input = document.getElementById(id);
		if(input.value != "") document.getElementById("img"+id).style.visibility='visible';
		else document.getElementById("img"+id).style.visibility='hidden';	
	}
	if ((document.getElementById("naam").value != "") && (document.getElementById("imgemail").style.visibility != "hidden") && (document.getElementById("tel").value != "") && (document.getElementById("adres").value != "") && (document.getElementById("pcenp").value != "")) {
		document.getElementById("knopje").disabled = false;
	}
	else {
		document.getElementById("knopje").disabled = true;
	}
}