if (document.images) {
  		btn_whatsonon = new Image(); 
  		btn_whatsonon.src = "images/index_10.jpg";

		
  		btn_whatsonoff = new Image(); 
  		btn_whatsonoff.src = "images/index_10.jpg";
  	}
	function changeImages() {
  		if (document.images) {
   			for (var i=0; i<changeImages.arguments.length; i+=2) {
      			document[changeImages.arguments[i]].src = eval(changeImages.arguments[i+1] + ".src");
    			}
  			}
		}