function ImgRoll() {
  if(document.getElementsByTagName) {
    var images = document.getElementsByTagName("img");  
    for(var i=0; i < images.length; i++) {
      if(images[i].getAttribute("src").match("_off."))  {
        images[i].onmouseover = function() {
            this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));  
        }  
        images[i].onmouseout = function() {
            this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));  
        }
      }
    }
  }
}
function ddMenu(id,d,mp){
	var c = document.getElementById(id);
	if(d == 1){
		c.style.display = 'block';
		document.images[id + '_bt'].src = mp;
	}else{
		c.style.display = 'none';
		document.images[id + '_bt'].src = mp;
	}
}