function MM_findObj(n, d) { //v4.0
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=MM_findObj(n,d.layers[i].document);
  if(!x && document.getElementById) x=document.getElementById(n); return x;
}

function MM_showHideLayers() { //v3.0
  var i,p,v,obj,args=MM_showHideLayers.arguments;
  for (i=0; i<(args.length-2); i+=3) if ((obj=MM_findObj(args[i]))!=null) { v=args[i+2];
    if (obj.style) { obj=obj.style; v=(v=='show')?'visible':(v='hide')?'hidden':v; }
    obj.visibility=v; }
}
//::toggleKey:: activate decription keys.
 function toggleKey (id) {
		document.getElementById(id).style.display = "block";
}
//::showSym:: activate decription keys.
//innerHTML is used as an alternative to the method of document.createElement();
 function showSym(event,description,flagimg) { //show key
		document.getElementById("symDesc").innerHTML = description;
		document.getElementById("symIntro").style.display = "none";
		document.getElementById("symBox").style.display = "block";
}
//::hideSym:: hide decription keys for five day forecast symbols.
 function hideSym() { //hide key
		document.getElementById("symBox").style.display = "none";
		document.getElementById("symIntro").style.display = "block";
}


//::random image::
var theImages = new Array()

theImages[0] = 'images/header-01.jpg'
theImages[1] = 'images/header-02.jpg'
theImages[2] = 'images/header-03.jpg'
theImages[3] = 'images/header-04.jpg'

var j = 0
var p = theImages.length;
var preBuffer = new Array()
for (i = 0; i < p; i++){
   preBuffer[i] = new Image()
   preBuffer[i].src = theImages[i]
}
var whichImage = Math.round(Math.random()*(p-1));
function showImage(){
document.write('<img src="'+theImages[whichImage]+'">');
}