function none(){
  return false;
}

function newImage(arg) {
  if (document.images) {
    rslt = new Image();
    rslt.src = arg;
    return rslt;
  }
}

function changeImages() {
  if (document.images && (preloadFlag == true)) {
    for (var i=0; i<changeImages.arguments.length; i+=2) {
      document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
    }
  }
}

var preloadFlag = false;

function MM_preloadImages() { //v3.0
  var d=document; 
  if(d.images) { 
     if(!d.MM_p) d.MM_p=new Array();
     var i,j=d.MM_p.length,a=MM_preloadImages.arguments; 
     for(i=0; i<a.length; i++)
     if(a[i].indexOf("#")!=0) { 
        d.MM_p[j]=new Image; 
	d.MM_p[j++].src=a[i];
     }
  preloadFlag = true;
  }
}

function DoPreload()
{
  MM_preloadImages('_img/i_home.gif','_img/i_home_l.gif','_img/i_email.gif','_img/i_email_l.gif');
}