/*
imgタグに「rollover」というclassを追加。
ロールオーバー用の画像を「画像名+_a」で保存。
*/

function initRollovers() {
	if (!document.getElementById) return

	var aPreLoad = new Array();
	var sTempSrc;
	var aImages = document.getElementsByTagName('img');

	for (var i = 0; i < aImages.length; i++) {		
		if (aImages[i].className == 'rollover') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_a'+ftype);

			aImages[i].setAttribute('hsrc', hsrc);
			aPreLoad[i] = new Image();
			aPreLoad[i].src = hsrc;

			aImages[i].onmouseover = function() {
				sTempSrc = this.getAttribute('src');
				this.setAttribute('src', this.getAttribute('hsrc'));
			}	

			aImages[i].onmouseout = function() {
				if (!sTempSrc) sTempSrc = this.getAttribute('src').replace('_a'+ftype, ftype);
				this.setAttribute('src', sTempSrc);

			}
		}
	}
}



window.onload = initRollovers;


function M_swapImgRestore() { //v3.0
  var i,x,a=document.M_sr; for(i=0;a&&i<a.length&&(x=a[i])&&x.oSrc;i++) x.src=x.oSrc;
}

function M_preloadImages() { //v3.0
  var d=document; if(d.images){ if(!d.M_p) d.M_p=new Array();
    var i,j=d.M_p.length,a=M_preloadImages.arguments; for(i=0; i<a.length; i++)
    if (a[i].indexOf("#")!=0){ d.M_p[j]=new Image; d.M_p[j++].src=a[i];}}
}

function M_findObj(n, d) { //v4.01
  var p,i,x;  if(!d) d=document; if((p=n.indexOf("?"))>0&&parent.frames.length) {
    d=parent.frames[n.substring(p+1)].document; n=n.substring(0,p);}
  if(!(x=d[n])&&d.all) x=d.all[n]; for (i=0;!x&&i<d.forms.length;i++) x=d.forms[i][n];
  for(i=0;!x&&d.layers&&i<d.layers.length;i++) x=M_findObj(n,d.layers[i].document);
  if(!x && d.getElementById) x=d.getElementById(n); return x;
}

function M_swapImage() { //v3.0
  var i,j=0,x,a=M_swapImage.arguments; document.M_sr=new Array; for(i=0;i<(a.length-2);i+=3)
   if ((x=M_findObj(a[i]))!=null){document.M_sr[j++]=x; if(!x.oSrc) x.oSrc=x.src; x.src=a[i+2];}
}