$(function(){
    $("img.rollover").each(function(){
        $("<img>").attr("src",$(this).attr("src").replace(/^(.+)(\.[a-z]+)$/, "$1_on$2"));
    })
    if($.browser.msie && $.browser.version<7){
        $("img.rollover").each(function(){
            
            $(this)
                .data("src",$(this).attr("src"))
                .attr("src","img/_.gif")
                .css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+$(this).data("src")+"',sizingMethod='scale')")
            
        }).mouseover(function(){
            $(this).css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+$(this).data("src").replace(/^(.+)(\.[a-z]+)$/, "$1_on$2")+"',sizingMethod='scale')")
        }).mouseout(function(){
            $(this).css("filter","progid:DXImageTransform.Microsoft.AlphaImageLoader(src='"+$(this).data("src")+"',sizingMethod='scale')")
        })
        
    }else{
        $("img.rollover").mouseover(function(){
            $(this).attr("src",$(this).attr("src").replace(/^(.+)(\.[a-z]+)$/, "$1_on$2"));
        }).mouseout(function(){
            $(this).attr("src",$(this).attr("src").replace(/^(.+)_on(\.[a-z]+)$/, "$1$2"));
        })
    }
})