var image_fish = 'http://www.marucho.co.jp/bay/image/common/ishidai.gif';			//画像のURL
var speed = 65;			//基本速度
var speed2 = 15;			//基本速度2(0はダメ・小さい程大きく動く)
var msleft = 10;			//Ｘ
var mstop = 10;			//Ｙ

var msx = 0;
var msy = 0;
var tox = 0;
var toy = 0;

if (document.getElementById) {
	document.write('<span id="S" style="position: absolute;"><img src="' + image_fish + '"></span>');
	document.onmousemove = toms;
	setInterval("movems();", speed);
}

function toms(e)
{
	if (e) {
		tox = e.pageX + document.body.scrollLeft + msleft;
		toy = e.pageY + document.body.scrollTop + mstop;
	}
	else {
		tox = event.clientX + document.body.scrollLeft + msleft;
		toy = event.clientY + document.body.scrollTop + mstop;
	}
}

function movems()
{
	var xx = Math.abs(tox - msx) / speed2;
	if(tox > msx) {
		msx += xx;
	} else if (tox + 1 < msx) {
		msx -= xx;
	}
	xx = 1;
	xx = Math.abs(toy - msy) / speed2;
	if(toy > msy) {
		msy += xx;
	} else if (toy + 1 < msy) {
		msy -= xx;
	}

	if(document.getElementById) {
		var o = document.getElementById("S");
		if (o) {
			o.style.left = msx + "px";
			o.style.top = msy + "px";;
			o.style.pixelLeft = msx;
			o.style.pixelTop = msy;
		}
	}
}