function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      if (oldonload) {
        oldonload();
      }
      func();
    }
  }
}

function getObject(obj_name) {
	var obj;
	if (typeof obj_name == "string") {
		if (document.all) {
			obj = eval("document.all." + obj_name);
		} else {
			obj = document.getElementById(obj_name);
		}
	} else {
		obj = obj_name;
	}
	return (obj);
}

var myWidth = 0, myHeight = 0;

function determineInnerSize() {
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
}

function adjustLayout() {
	determineInnerSize();
	
	var container = getObject("container");
	
	try {
		if (container.offsetHeight < myHeight) {
			container.style.height = myHeight + "px";
		}
	} catch (e) {}
}

function preloadImages() {
	var img = new Image();
	img.src = "mysite/images/tab_voet_nohoverback.png";
	img.src = "mysite/images/tab_voet_nohoverfront.png";
	img.src = "mysite/images/tab_voet_hover.png";
	img.src = "mysite/images/tab_noot_nohoverback.png";
	img.src = "mysite/images/tab_noot_nohoverfront.png";
	img.src = "mysite/images/tab_noot_hover.png";
}

function highlightTab(tab) {
	if (tab == "noodt") {
		getObject("voetMenu").style.display = "none";
		getObject("noodtMenu").style.display = "block";
		getObject("voetTab").src = "mysite/images/tab_voet_nohoverback.png";
		getObject("noodtTab").src = "mysite/images/tab_noot_nohoverfront.png";
	} else {
		getObject("voetMenu").style.display = "block";
		getObject("noodtMenu").style.display = "none";
		getObject("voetTab").src = "mysite/images/tab_voet_nohoverfront.png";
		getObject("noodtTab").src = "mysite/images/tab_noot_nohoverback.png";
	}
}

addLoadEvent(adjustLayout);
addLoadEvent(preloadImages);
addLoadEvent(highlightTab);