function fade(id){
			element = $(id);
			new Effect.SlideDown(element);
		}
		function change_bg(ov,id){
			if(ov == 1){
				document.getElementById(id+'_A').className = "bg_on";
				document.getElementById(id+'_B').className = "bg_on";
			}else{
				document.getElementById(id+'_A').className = "bg_off";
				document.getElementById(id+'_B').className = "bg_off";
			}
		}