$(function(){
	//!document.getElementById('piao')||$('#piao').imgFloat({speed:30,xPos:0,yPos:0});
	});

function loca(url){location.href=url;}

(function($){
	jQuery.fn.imgFloat=function(options){
		var own=this;
		var xD=0;
		var yD=0;
		var i=1;
		var settings={
			speed:10,
			xPos:0,
			yPos:0
		};
		jQuery.extend(settings, options);
		var ownTop=settings.xPos;
		var ownLeft=settings.yPos;
		own.css({
			position:"absolute",
			cursor:"pointer"
		});
		function imgPosition(){
			var winWidth=$(window).width()-own.width();
			var winHeight=$(window).height()-own.height();
			if(xD==0){
				ownLeft+=i;
				own.css({
					left:ownLeft
				});
				if(ownLeft>=winWidth){
					ownLeft=winWidth;
					xD=1;
				}
			}
			if(xD==1){
				ownLeft-=i;
				own.css({
					left:ownLeft
				});
				if(ownLeft<=0)xD=0;
			}
			if(yD==0){
				ownTop+=i;
				own.css({
					top:ownTop
				});
				if(ownTop>=winHeight){
					ownTop=winHeight;
					yD=1;
				}
			}
			if(yD==1){
				ownTop-=i;
				own.css({
					top:ownTop
				});
				if(ownTop<=0)yD=0;
			}
		}
		var imgHover=setInterval(imgPosition, settings.speed);
		own.hover(function(){
			clearInterval(imgHover);
		},
		function(){
			imgHover=setInterval(imgPosition, settings.speed);
		});
	}
})(jQuery);