function initRollOvers() {
    if (!document.getElementById){
        return;
    }

    var preLoads = new Array();
    var allImages = document.getElementsByTagName('img');

    for (var i = 0; i < allImages.length; i++) {       
        if (allImages[i].className == 'iirover') {
            var pSrc = allImages[i].getAttribute('src');
            var oSrc = pSrc.substr(0, pSrc.lastIndexOf('-')) + '-01.jpg';

            allImages[i].setAttribute('pSrc', pSrc);
            allImages[i].setAttribute('oSrc', oSrc);

            preLoads[i] = new Image();
            preLoads[i].src = oSrc;

            allImages[i].onmouseover = function() {
                this.setAttribute('src', this.getAttribute('oSrc'));
            }
            allImages[i].onmouseout = function() {
                this.setAttribute('src', this.getAttribute('pSrc'));
            }
        }
    }
}
 
function addOnload(func){
    if ( typeof window.addEventListener != "undefined" ){
        window.addEventListener( "load", func, false );
    }else if ( typeof window.attachEvent != "undefined" ) {
        window.attachEvent( "onload", func );
    }else{
        if ( window.onload != null ){
            var oldOnload = window.onload;
            window.onload = function ( e ) {
            oldOnload( e );
            window[func]();
        };
    }else
        window.onload = func;
    }
}
addOnload(initRollOvers);