if (document.images) {

 prwdon = new Image();
 prwdon.src = "/images/prwd_logo_on.gif";

 prwdoff = new Image();
 prwdoff.src = "/images/prwd_logo_off.gif";
 
 prcdon = new Image();
 prcdon.src = "/images/prcd_logo_on.gif";

 prcdoff = new Image();
 prcdoff.src = "/images/prcd_logo_off.gif";

 }

function addLoadEvent(func) {
    var oldonload = window.onload;
    if (typeof window.onload != 'function') {
        window.onload = func;
    } else {
        window.onload = function() {
            if (oldonload) {
                oldonload();
            }
            func();
        }
    }
}