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 == 'btn') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_on'+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('_x'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}
window.onload = initRollovers;


//マックCSS用スクリプト
var cssurl = "";
var Mac = navigator.userAgent.indexOf("Mac") != -1 ? true : false 


if (document.getElementById) { 
	if(Mac) cssurl = "http://www.seo-clare.com//css/mac.css" // Mac W3C対応ブラウザ用CSS 
} else if (document.all) { 
	if(Mac) cssurl = "http://www.seo-clare.com//css/mac.css" // Mac IE用CSS 
} 

if(cssurl){
	//CSS読み込みタグlinkの書き出し 
	document.write('<link rel="stylesheet" ') ;
	document.write(' type="text/css" ');
	document.write(' href="'+cssurl+'"') ;
	document.write('>') ;

}