$(document).ready(function() {
    // preload all rollover images
    $(".Rollover").each(
        function() {
            if (this.src == undefined)
                return;

            var index = this.src.lastIndexOf(".");

            (new Image()).src = this.src.substr(0, index) + "_Over" + this.src.substr(index);
        }
    )
    // setup rollover actions
    $(".Rollover").hover(
        function() {
            if (this.src == undefined)
                return;

            var index = this.src.lastIndexOf(".");

            this.src = this.src.substr(0, index) + "_Over" + this.src.substr(index);

            /*if (this.src.search("_Over") < 0)
            this.src = this.src.replace(".", "_Over.");*/
        },
        function() {
            if (this.src == undefined)
                return;

            var index = this.src.lastIndexOf("_Over.");

            this.src = this.src.substr(0, index) + this.src.substr(index + 5);
        }
    )
});