$(document).ready( function(){
						$("a.screenshot").colorbox({speed:200, transition: "fade", previous:"←前", next:"次→", close:"×閉じる"});
					} );

function fBacktoTop() {
	var d=document;
	var scroll_left=d.body.scrollLeft || d.documentElement.scrollLeft || d.scrollX || 0;
	var scroll_top=d.body.scrollTop || d.documentElement.scrollTop || d.scrollY || 0;
	scrollTo(scroll_left, scroll_top/1.5);

	if(scroll_left>1 || scroll_top>1){
		var f=setTimeout("fBacktoTop()", 33);
	}else{
		scrollTo(scroll_left, 0);
		clearTimeout(f);
	}
}