function showHide(linkid,id,laatzien,verberg){
	if (document.getElementById(id).style.display=='none'){
		document.getElementById(linkid).childNodes[0].nodeValue = verberg;		
		document.getElementById(id).style.display = 'block';		
	} else {
		document.getElementById(linkid).childNodes[0].nodeValue = laatzien;				
		document.getElementById(id).style.display = 'none';
	}
}
function move(object_id,cat_id,merk_id,type_id,activity_id,type){
	showHide('sh_move','move','Verplaats','Verberg');
	getMover(object_id,cat_id,merk_id,type_id,activity_id,type);
}
function confirmFriend(naam,url){
	var check = confirm("Wilt u fan worden van " + naam + "?");
	if (check) {
		document.location.href=url;
	}
	return true;
}
function isInt(x) {
	var y=parseInt(x);
	if (isNaN(y)) return false;
	return x==y && x.toString()==y.toString();
} 
function confirmDel(naam,url){
	var check = confirm("Wil je " + naam + " verwijderen?");
	if (check) {
		document.location.href=url;
	}
	return true;
}
function listen(evnt, elem, func) {
    if (elem.addEventListener)  // W3C DOM
        elem.addEventListener(evnt,func,false);
    else if (elem.attachEvent) { // IE DOM
         var r = elem.attachEvent("on"+evnt, func);
    return r;
    }
    
}

function check_topicform(which, verplicht){
	var empty = false;	
	for (i=0;i<which.length;i++){
		var veld=which.elements[i];
		if(veld.type=="text"){
			//Maak alle achtergronden (weer) wit
			veld.style.background="#FFFFFF";
		}
		for (j=0;j<verplicht.length;j++){
			if(veld.type=="text" && veld.name==verplicht[j][0] && veld.value==''){
				veld.style.background="#FFBB99";
				empty = true;
			}
			if(veld.type=="textarea" && veld.name==verplicht[j][0] && veld.value==''){
				veld.style.background="#FFBB99";
				empty = true;
			}
		}
		
	}
	if(empty){
		alert("Niet alle verplichte velden zijn ingevuld.");
		return false;
	} else {
		which.spamchecker.value = "GEEN_SPAM";
		return true;
	}
}