function smartRollover() {
     if(document.getElementsByTagName) {
         var images = document.getElementsByTagName("img");
         for(var i=0; i < images.length; i++) {
             if(images[i].getAttribute("src").match("_off."))
             {
                 images[i].onmouseover = function() {
                     this.setAttribute("src", this.getAttribute("src").replace("_off.", "_on."));
                 }
                 images[i].onmouseout = function() {
                     this.setAttribute("src", this.getAttribute("src").replace("_on.", "_off."));
                 }
             }
         }
     }
 }
 if(window.addEventListener) {
     window.addEventListener("load", smartRollover, false);
 }
 else if(window.attachEvent) {
     window.attachEvent("onload", smartRollover);
}

/*別ウィンドウ*/
function openwin(url) {
 w = window.open(url, 'win','width=680,height=680,status=no,scrollbars=yes,directories=no,menubar=no,resizable=yes,toolbar=no');
}