// 画像ロールオーバー



(function() {

var filename = 'orijinal.js';

var _className = 'chg';



function getJsParam() {

	//get scripts list.

	var scripts = document.getElementsByTagName( 'script' );

	var script;

	var params = {};

	

	//pickup this file.

	for ( var i=0; i<scripts.length; i++ ) {

		var s = scripts.item( i );

		if( s.src.indexOf( filename ) !== -1 ) {

			script = s;

			break;

		}

	}

	

	if( script ) {

		script.src.match( /(.*)(\?)(.*)/ );

		if( RegExp.$3 ) {

			var a = RegExp.$3.split( '&' );

			if( a ) {

				for( var k=0; k<a.length; k++ ) {

					var p = a[ k ].split( '=' );

					if( p[0] ) {

						params[ p[0] ] = p[1];

					}

				}

			} else {

				return false;

			}

		} else {

			return false;

		}

	} else {

		return false;

	}

	

	return params;

}



function addEvent( node, evt, handler ) {

	try {

		if( node.addEventListener ) {

			node.addEventListener( evt, handler, false );

		} else {

			node.attachEvent( 'on' + evt, handler );

		}

	} catch( e ) {}

}



function setEvent( ele, ty ) {

	ele.originalSrc = ele.src;

	ele.originalSrc.match( /^(.*)(\.{1}.*)/g );

	ele.hoverSrc = RegExp.$1 + ty + RegExp.$2;

	addEvent( ele, 'mouseover', function( evt ) {

		var tar = evt.target || evt.srcElement;

		tar.src = tar.hoverSrc;

	});

	addEvent( ele, 'mouseout', function( evt ) {

		var tar = evt.target || evt.srcElement;

		tar.src = tar.originalSrc;

	});

}



function startRollover() {

	var jParam = getJsParam();

	var jType = jParam.type ? jParam.type : '_on';

	var imgs = document.getElementsByTagName( 'img' );

	for( var i=0; i<imgs.length; i++ ) {

		if( imgs[i].className.indexOf( _className ) !== -1 ) {

			setEvent( imgs[i], jType );

		}

	}

}



addEvent( window, 'load', startRollover );

})();