// Javascript file for Banner display

var showBannerFlag = false;

// DATA
var theBanners = [];
// Banner file - Banner URL
theBanners[0] = ["BBWEBAD.gif","http:\/\/blinkbid.com\/"];
theBanners[1] = ["LAF2010_468_60.gif","http:\/\/www.londonartfair.co.uk"];

// FUNCTION THAT CHECKS THE DOM 
function getObj(name){
if (document.getElementById)
{this.obj = document.getElementById(name);}
else if (document.all)
{this.obj = document.all[name];}
else if (document.layers)
{this.obj = document.layers[name];}
}

var GetRandomNum = function(thenum) {
	var rndm = Math.floor(Math.random()*thenum);
	return rndm;
};

function doHide(theObject,theAction) {
	var thisHiding = new getObj(theObject);
	if(typeof thisHiding != "undefined") {
	if (theAction == "hidden") {
	thisHiding.obj.className = "make_hidden";	
	}
	else {
	thisHiding.obj.className = "make_none";	
	}
	}
}

function doShow(theObject, theAction) {
	var thisShowing = new getObj(theObject);
	if(typeof thisShowing != "undefined") {
	if (theAction == "block") {
	thisShowing.obj.className = "make_block";	
	}
	else {
	thisShowing.obj.className = "make_visible";	
	}
	}
}

window.onload = function() {
if (showBannerFlag) {
var thisBannerNum = GetRandomNum(theBanners.length);
var thisBannerGraphic = "http:\/\/home.the-aop.org\/banners\/" + theBanners[thisBannerNum][0];
var thisBannerURL = theBanners[thisBannerNum][1];
var thisBannerHTML = "<a href='" + thisBannerURL + "' target='_blank'><img src='" + thisBannerGraphic + "' border='0' \/><\/a>";
var thisBanner = new getObj("showBanner");
thisBanner.obj.innerHTML = thisBannerHTML;
doShow("showBanner","block");
}
}