function changeBG(item,visible,path){
	if(visible == 1)
		document.getElementById(item).style.background = "url("+path+"images/bt_"+item+".jpg) no-repeat 0 0";
	else	
		document.getElementById(item).style.background = "url("+path+"images/bt_"+item+".jpg) no-repeat 0 -20px";
}