var _Common_ = {
  initRollovers:function(){
    if (!document.getElementById) return
    var aPreLoad = new Array();
    var sTempSrc;
    var aImages = document.getElementsByTagName('img');
    var img_Len = aImages.length;
    for (var i = 0; i < img_Len; i++) {    
      if (aImages[i].className == 'over') {
        var src = aImages[i].getAttribute('src');
        var ftype = src.substring(src.lastIndexOf('.'), src.length);
        var hsrc = src.replace(ftype, '_over'+ftype);
  
        aImages[i].setAttribute('hsrc', hsrc);
        aPreLoad[i] = new Image();
        aPreLoad[i].src = hsrc;
        aImages[i].onmouseover = function() {
          sTempSrc = this.getAttribute('src');
          this.setAttribute('src', this.getAttribute('hsrc'));
        }  
        aImages[i].onmouseout = function() {
          if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_x'+ftype, ftype);
          this.setAttribute('src', sTempSrc);
        }
      }
    }   
    return;
  },
  addLoadEvent:function(func){
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
      window.onload = func;
    }
    else {
      window.onload = function() {
        func();
        oldonload();
      }
    }
  }
}

function swpimg(n){
  var imgsrc = document.images[n].src;
  var ext = imgsrc.substring(imgsrc.lastIndexOf("."), imgsrc.length);
  
  if(imgsrc.indexOf("_ov") < 0){
    document.images[n].src=imgsrc.substring(0,imgsrc.length-ext.length) + "_ov" + ext;
  }
  else{
    document.images[n].src=imgsrc.substring(0,imgsrc.length-ext.length-3) + ext;
  }
}


_Common_.addLoadEvent(_Common_.initRollovers);


var DDSPEED = 10;
var DDTIMER = 15;

// main function to handle the mouse events //
function ddMenu(id,d){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearInterval(c.timer);
  if(d == 1){
    clearTimeout(h.timer);
    if(c.maxh && c.maxh <= c.offsetHeight){return}
    else if(!c.maxh){
      c.style.display = 'block';
      c.style.height = 'auto';
      c.maxh = c.offsetHeight;
      c.style.height = '0px';
    }
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }else{
    h.timer = setTimeout(function(){ddCollapse(c)},50);
  }
}

// collapse the menu //
function ddCollapse(c){
  c.timer = setInterval(function(){ddSlide(c,-1)},DDTIMER);
}

// cancel the collapse if a user rolls over the dropdown //
function cancelHide(id){
  var h = document.getElementById(id + '-ddheader');
  var c = document.getElementById(id + '-ddcontent');
  clearTimeout(h.timer);
  clearInterval(c.timer);
  if(c.offsetHeight < c.maxh){
    c.timer = setInterval(function(){ddSlide(c,1)},DDTIMER);
  }
}

// incrementally expand/contract the dropdown and change the opacity //
function ddSlide(c,d){
  var currh = c.offsetHeight;
  var dist;
  if(d == 1){
    dist = (Math.round((c.maxh - currh) / DDSPEED));
  }else{
    dist = (Math.round(currh / DDSPEED));
  }
  if(dist <= 1 && d == 1){
    dist = 1;
  }
  c.style.height = currh + (dist * d) + 'px';
  c.style.opacity = currh / c.maxh;
  c.style.filter = 'alpha(opacity=' + (currh * 100 / c.maxh) + ')';
  if((currh < 2 && d != 1) || (currh > (c.maxh - 2) && d == 1)){
    clearInterval(c.timer);
  }
}


function addBookmark(url,title) { 
    if (window.sidebar) { 
        window.sidebar.addPanel(title, url,""); 
    } else if( document.all ) { 
        window.external.AddFavorite( url, title); 
    } else if( window.opera && window.print ) { 
        return true; 
    } 
}