/*
 *
 *	www.vnof.nl - javascript functions
 *
 */


function checkForm(objForm) {
	if (!objForm)
		objForm = document.forms[0];
	for (var f=0; f<objForm.length; f++) {
		if (objForm[f].type != "hidden") {
			if (objForm[f].value == "" && typeof objForm["mandatory_"+objForm[f].name] != "undefined") {
				alert("Het veld '"+objForm[f].name+"' is verplicht");
				objForm[f].focus();
				return false;
			}
		}
	}
	return true;
}
function popupimage(s) {
	var oImage = new Image();
	oImage.src = s;
	if (document.layers) { // netscape 4.x
		oImage.onLoad = _after_image_loaded;
	} else {
		_after_image_loaded(oImage,s);
	}
}
function _after_image_loaded(evnt,s) {
	var oImage;
	if (document.layers) { // netscape 4.x
		oImage = evnt.target;
	} else {
		oImage = evnt;
	}
	//document.write(oImage.src);
	//return false;
	window.open('viewimage.asp?img='+escape(s), "nwwin",
		'toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars=no,resizable=no,'+
		'left='+((screen.width-oImage.width)/2)+',top='+((screen.height-oImage.height)/2)+','+
		'width='+(oImage.width+10)+',height='+(oImage.height+10)+'');
	//window.open('viewimage.asp?img='+(s)+'');
}



/*
 *	added functions for 'huurders' page
 */

var table_object, cur_ref_obj, cur_letter = "alles", let_a, arrFound;
function init_letters(tbl_id) {
	table_object = document.getElementById(tbl_id);
	cur_ref_obj = document.getElementById("ref_alles");

	let_a = ("A").toLowerCase().charCodeAt(0);
	arrFound = new Array();
	for (var i=0; i<=26; i++) {
		arrFound[i] = false;
	}

	for (var i=0; i<table_object.rows.length; i++) {
		if (table_object.rows[i].cells.length > 0) {
			var let = textContent(i).charCodeAt(0);
			arrFound[(let < let_a) ? 0 : (let+1-let_a)] = true;
		}
	}

	// show letter choices, if javascript is disabled, all entries are shown by default and no choices offered
	var div_obj = document.getElementById("letters");
	var hrefNodes = div_obj.getElementsByTagName("a");
	for (var i=0; i<=26; i++) {
		hrefNodes[i+1].className = (arrFound[i]) ? "clbhref" : "nohref";
	}
	div_obj.style.display = "block";

}
function changeLetter(new_letter) {
	if (cur_letter != new_letter) {
		for (var i=0; i<table_object.rows.length; i++) {
			if (table_object.rows[i].cells.length > 0) {
				table_object.rows[i].style.display = ("alles" == new_letter || ("#" == new_letter && textContent(i).substr(0,1) < 'a') || textContent(i).substr(0,1) == new_letter) ? "" : "none";
			}
		}

		// restore previous href
		cur_ref_obj.className = (arrFound[("alles" == cur_letter) ? 0 : (("#" == cur_letter) ? 1 : (cur_letter.charCodeAt(0) + 1 - let_a))]) ? "clbhref" : "nohref";
		// set new href 'active'
		var ref_obj = document.getElementById("ref_"+new_letter);
		ref_obj.className = "curhref";

		cur_letter = new_letter;
		cur_ref_obj = ref_obj;
	}
}
function textContent(i) { // decide which property to use for text content of first cell of table row i
	var res = "", objCell = table_object.rows[i].cells[0];
	if (objCell.textContent)
		res = objCell.textContent; // FireFox
	else
		res = objCell.innerText; // IE
	res = (""+res).replace(/\s+/, "").toLowerCase(); // &nbsp;
	return res;
}


/*
 *
 *	Macromedia functions
 *
 */

function MM_swapImgRestore() { //v3.0
  var i,x,a=document.MM_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function MM_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.MM_p) d.MM_p=new Array();
    var i,j=d.MM_p.length,a=MM_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.MM_p[j]=new Image; d.MM_p[j++].src=a[i];}}
}

function MM_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function MM_swapImage() { //v3.0
  var i,j=0,x,a=MM_swapImage.arguments; document.MM_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=MM_findObj(a[i]))!=null){document.MM_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}