$(function(){
    var pos = $.cookie('image_index');
    if(pos === null || pos >= promoImages.length){
        pos = 0;
    }
    var num = pos;
   	// Pick a random number 
   	if(promoImages.length > 1){
	    while(num == pos){
   		    num = Math.floor(Math.random()*promoImages.length);
	    }
   	}
    var promotion = $('#promotion');
    promotion.empty();
    var img = promoImages[num];
    if(img.link){
        promotion = $('<a></a>').attr('href', img.link).appendTo(promotion);
    }
    $('<img/>').attr('src', img.src.replace('/Services and Administration/OIT/content', '')).appendTo(promotion);
    $.cookie('image_index', num);
});