// Roll Over
// <a href="xxx.html" class="rollover">
var overTail = 'ov';
var defaultTail = '';

var rollover = new Object();

rollover={
	init:function(){
		if(d.getElementById){
			rollover.makeRollover.init("autoSwapImg");
		}
	},
	end:function(){
		 fixIELeaks();
	}
};

rollover.makeRollover={
	init: function(className){
		var imgPreload = new Image();
		var parent = d.getElementsByClassName(className);
		if (! parent) { return; }
		for(var i = 0; i < parent.length; i++) {
			var imagesToRoll = parent[i].getElementsByTagName("img");
			for(var j = 0; j < imagesToRoll.length; j++){
				if(imagesToRoll[j].src){
					imagesToRoll[j].source = imagesToRoll[j].src;
					imagesToRoll[j].onmouseover = function(){
						imagePath = this.source.substring(0,this.source.length - defaultTail.length - 4);
						imageExt = this.source.substring(this.source.length - 4);
						imageRoll = imagePath + overTail + imageExt;
						this.src = imageRoll;
					}
					imagesToRoll[j].onmouseout = function(){
						this.src = this.source;
					}
				}
			}
			var imagesToRoll = parent[i].getElementsByTagName("input");
			for(var j = 0; j < imagesToRoll.length; j++){
				if(imagesToRoll[j].src){
					imagesToRoll[j].source = imagesToRoll[j].src;
					imagesToRoll[j].onmouseover = function(){
						imagePath = this.source.substring(0,this.source.length - defaultTail.length - 4);
						imageExt = this.source.substring(this.source.length - 4);
						imageRoll = imagePath + overTail + imageExt;
						this.src = imageRoll;
					}
					imagesToRoll[j].onmouseout = function(){
						this.src = this.source;
					}
				}
			}
		}	
	}
}

/*　デフォルトに入っている為。
document.getElementsByClassName = function(classname) {
	var elements = new Array();
	var re = new RegExp('(^| )'+classname+'( |$)');
	var ael = document.getElementsByTagName('*');
	var op = (navigator.userAgent.indexOf("Opera") != -1) ? true : false;
	if (document.all && !op) ael = document.all;
		for(i=0, j=0 ; i<ael.length ; i++) {
			if(re.test(ael[i].className)) {
				elements[j]=ael[i];
				j++;
			}
		}
	return elements;
};
*/

function fixIELeaks() {
	if (d.all && window.attachEvent) {
		var elProps = [
			"data", "onmouseover", "onmouseout",
			"onmousedown", "onmouseup", "ondblclick",
			"onclick", "onselectstart", "oncontextmenu"
		];
		var all = d.all;
		for (var i = 0, el; el = all[i]; i++) {
			for (var j = 0, elProp; elProp = elProps[j]; j++) {
				el[elProp] = null;
			}
		}
	}
};



document.observe('dom:loaded', function () { rollover.init(); });