var layerSwitch = "document.all['";
	var styleSwitch = "']";
	var ie = true;
	var ns4 = false;
	var ns6 = false;
	
	function checkBrowser() 
	{
		if (document.layers) {
			layerSwitch = "document.layers['";
      		styleSwitch = "']";
			available_width=innerWidth;
  			available_height=innerHeight;
   			ie = false;
   			ns4 = true;
   			ns6 = false;
		} else if (document.all) {
			layerSwitch = "document.all['";
      		styleSwitch = "'].style";
   			available_width=document.body.clientWidth;
 			available_height=document.body.clientHeight;
   			ie = true;
   			ns4 = false;
   			ns6 = false;
		} else {
			layerSwitch = "document.getElementById('";
      		styleSwitch = "').style";
   			available_width=innerWidth;
 			available_height=innerHeight;
   			ie = false;
   			ns4 = false;
   			ns6 = true;
		}
	}

	function mouseoverImage (imageName) 
	{	
		checkBrowser();
	
		if (document.images) {
			if (ie || ns6) {
				document[imageName].src = eval (imageName + 'ON.src') ;
			}
			else 
			{
				eval (layerSwitch + layer + styleSwitch + '.document').images[imageName].src = eval(imageName + 'ON.src');
			}
		}
	}

	function mouseoutImage (imageName) 
	{
		checkBrowser();
		
		if (document.images) {
			if (ie || ns6) 
			{
        		document[imageName].src = eval(imageName + '.src');
			} 
			else 
			{
	       		eval(layerSwitch + layer + styleSwitch + '.document').images[imageName].src = eval(imageName + '.src');
			}
		}
	}