function create_buttons(){
	if(document.images){
		for(var n=0;n<document.images.length;n++){
			if(document.images[n].name&&document.images[n].name.indexOf("btn_")>-1){
				document.images[n]["off_src"] = ""+document.images[n].src;
				document.images[n]["on_src"] = ""+document.images[n]["off_src"].substr(0,document.images[n]["off_src"].length-4)+"_mo"+document.images[n]["off_src"].substr(document.images[n]["off_src"].length-4,4);
				// make sure selected button will not MO on mouseover:
				if(document.images[n]["off_src"].indexOf("_mo.")<0){
					document.images[n].onmouseover = function(){this.src=this["on_src"]}
					document.images[n].onmouseout  = function(){this.src=this["off_src"]}
				}
			}
		}
	} 
}