//=============================================
// rollover
//=============================================

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 == 'over') {
			var src = aImages[i].getAttribute('src');
			var ftype = src.substring(src.lastIndexOf('.'), src.length);
			var hsrc = src.replace(ftype, '_ov'+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('_ov'+ftype, ftype);
				this.setAttribute('src', sTempSrc);
			}
		}
	}
}

function preloadImages(){
	var ar = new Array(
		'/common/img/gnavi01_ov.gif',
		'/common/img/gnavi02_ov.gif',
		'/common/img/gnavi03_ov.gif',
		'/common/img/gnavi04_ov.gif',
		'/common/img/gnavi05_ov.gif',
		'/common/img/gnavi01_on.gif',
		'/common/img/gnavi02_on.gif',
		'/common/img/gnavi03_on.gif',
		'/common/img/gnavi04_on.gif',
		'/common/img/gnavi05_on.gif');
	var imagePath;
	while(image = ar.pop()){
		preloadimg = new Image();
		preloadimg.src = image;
	}
}

window.onload = function(){
	initRollovers();
	preloadImages();
}