// JavaScript Document

function changeImage(name, url) {
  if (document.images[name]) {
    document.images[name].src = url;
  }
}

function preloadImage(url) {
  var i = new Image();
  i.src = url;
}

function preloadImages(urls) {
  var img = new Array();
  for (var i=0; i<urls.length; i++) {
    img[img.length] = new Image();
    img[img.length - 1].src = urls[i];
  }
}

function onload_csu() {
	 var img = new Array("images/mm_home_mo.jpg", "images/mm_overcsu_mo.jpg", "images/mm_news_mo.jpg", "images/mm_netwerk_mo.jpg", "images/mm_ouderenbnd_mo.jpg", "images/mm_vrijwlgr_mo.jpg", "images/mm_werkgr_mo.jpg", "images/aA_plus.jpg", "images/aA_min.jpg", "images/contact_mo.jpg", "images/subm_organisatie_mo.jpg", "images/subm_geschiedenis_mo.jpg");
	  preloadImages(img);	
}

function getXMLHttp() {
  var XMLHttp = null;
  if (window.XMLHttpRequest) {
    try {
      XMLHttp = new XMLHttpRequest();
    } catch (e) { }
  } else if (window.ActiveXObject) {
    try {
      XMLHttp = new ActiveXObject("Msxml2.XMLHTTP");
    } catch (e) {
      try {
        XMLHttp = new ActiveXObject("Microsoft.XMLHTTP");
      } catch (e) { }
    }
  }
  return XMLHttp;
}


function js_fontsizehandeling(action) {	
	function handlerFunction() {
	  if (XMLHttp.readyState == 4) {
		if (XMLHttp.responseText == 'plus') {
			document.getElementById("content").style.fontSize="16px";
			var coords = document.getElementById("fs_plus");
			coords.setAttribute("coords", "0,0,0,0");
			var coords2 = document.getElementById("fs_min");
			coords2.setAttribute("coords", "44,64,64,87");
		}
		if (XMLHttp.responseText == 'min') {
			document.getElementById("content").style.fontSize="12px";
			var coords = document.getElementById("fs_plus");
			coords.setAttribute("coords", "64,63,90,88");
			var coords2 = document.getElementById("fs_min");
			coords2.setAttribute("coords", "0,0,0,0");
		}
	  }
	}
	var XMLHttp = getXMLHttp();
	var geturl = 'handle_fontsize.php?action=' + action;
	//window.alert(geturl);
	XMLHttp.open("GET", geturl);
	XMLHttp.onreadystatechange = handlerFunction;
	XMLHttp.send(null);
}


function loadElement(f) {
	var img = document.getElementById("show_img");
	var imgFile = f.options[f.selectedIndex].value; 
	var newHTMLFragment = '<img src="../uploads_users/fotos/150/' + imgFile + '" />';
	if(f.options[f.selectedIndex].value == "geen") img.innerHTML = "&nbsp;";
	else img.innerHTML = newHTMLFragment;
}