//var imgBeforeMouseover="_images/nav_btns_01-down.gif";
	//var currentActiveButton = "nav_btns_01";
	//var imgBeforeMouseover="";
	//var currentActiveButton = "";
	
	function img_mouseover(buttonname)
	{
			//alert("a");
			//var n=navigator.appName
			//var v=parseInt(navigator.appVersion)
			//var browsok=((n=="Netscape")&&(v>=3))
			//var browsok2=((n=="Microsoft Internet Explorer")&&(v>=4))
			//if ((browsok)||(browsok2))
			

			var mouseoverimg = "_images/"+ buttonname+ "-over.gif";
			imgBeforeMouseover = document.images[buttonname].src;
			document.images[buttonname].src = mouseoverimg;
	}
	function img_mouseout(buttonname)
	{
			//alert("b");
			var mouseoutimg = imgBeforeMouseover;
			//alert("mouseoutimg is "+mouseoutimg);
			//alert("buttonname is: "+buttonname);
			document.images[buttonname].src = mouseoutimg;
	}
	function img_mouseclick(buttonname)
	{
		var mouseclickimg = "_images/"+ buttonname + "-down.gif";
		imgBeforeMouseover = mouseclickimg;
	}