/* 一覧表示の画像のリサイズ */
function image_resize_center( img , width_size , height_size ) {
  var now_width  = img.width;
  var now_height = img.height;

  var rate =  (width_size / height_size)  * height_size * (now_height / now_width );

  if(height_size < rate ){
    img.height = height_size;
    img.style.position = "relative";

/*    var tmp_width = now_width * height_size / now_height ;
    var move_px = ( width_size - tmp_width ) /2;

    img.style.left = move_px + "px";
*/
  }else{
    img.width = width_size;
    img.style.position = "relative";

    var tmp_height = now_height * width_size / now_width ;
    var move_px = ( height_size - tmp_height ) /2;

    img.style.top = move_px + "px";

  }
}

function shop_item_image_top_resize() {
	var oDiv = document.getElementById('item_image_top');
	if(oDiv){
		var img = oDiv.getElementsByTagName('img')[0];
		var now_width  = img.width;
		var now_height = img.height;

		if( now_width > 540 ){
			img.width = 540;
			img.height = now_height * 540 / now_width ;
		}
	}
}

function addShopItemImegeResizeEvent(func) {
	if (window.addEventListener) {
		window.addEventListener("load", func, false);
	} else if (window.attachEvent) {
		window.attachEvent("onload", func);
	}
}

addShopItemImegeResizeEvent(function(){
		shop_item_image_top_resize();
	}
);