用ondrag事件简单的实现鼠标拖动物件

<script> <!-- //Dhtml:用ondrag事件简单的实现鼠标拖动物件. //原作:风云舞 var xx=0,yy=0 // --> </script> <img src="http://www.lshdic.com/bbs/image/shajia.jpg" mce_src="http://www.lshdic.com/bbs/image/shajia.jpg" style="position:absolute;" mce_style="position:absolute;" οndragstart="setCapture();xx=event.x-this.offsetLeft;yy=event.y-this.offsetTop;" οndrag='this.style.left=event.x-xx;this.style.top=event.y-yy' οndragend="releaseCapture();">