var DHTML = (document.getElementById || document.all || document.layers);

function getObj(name)
{
    if (document.getElementById)
    {
        this.obj = document.getElementById(name);
        this.style = document.getElementById(name).style;
    }
    else if (document.all)
    {
        this.obj = document.all[name];
        this.style = document.all[name].style;
    }
    else if (document.layers)
    {
        this.obj = document.layers[name];
        this.style = document.layers[name];
    }
}

function invi(obj,flag)
{
    if (!DHTML) return;
    var x = new getObj(obj);
    x.style.visibility = (flag) ? 'visible' : 'hidden';
}


//WM_preloadImages()
//Source: Webmonkey Code Library
//(http://www.hotwired.com/webmonkey/javascript/code_library/)

function WM_preloadImages() {
   if (document.images) {
      if (typeof(document.WM) == 'undefined') {
         document.WM = new Object(); 
      }
      document.WM.loadedImages = new Array();
      var argLength = WM_preloadImages.arguments.length;
      for(arg=0;arg<argLength;arg++) {
         document.WM.loadedImages[arg] = new Image();
         document.WM.loadedImages[arg].src = WM_preloadImages.arguments[arg];
      }
   }
}

// WM_imageSwap()
// Source: Webmonkey Code Library
// (http://www.hotwired.com/webmonkey/javascript/code_library/)

function WM_imageSwap(daImage, daSrc) {
   var objStr,obj;
   if(document.images) {
      if (typeof(daImage) == 'string') {
         objStr = 'document.' + daImage;
         obj = eval(objStr);
         obj.src = daSrc;
      } else if ((typeof(daImage) == 'object') && daImage && daImage.src) {
         daImage.src = daSrc;
      }
   }
}