function setRollOver(){
 if(!document.getElementsByTagName) return false;
 var ovrImgList = document.getElementsByTagName("img");
 for(var i=0;i<ovrImgList.length;i++){
  if(ovrImgList[i].className.match("ovr")){
   ovrImgList[i].onmouseover = function(){
    this.src = this.src.replace(/_off/i,"_on");
    return false;
   }
   ovrImgList[i].onmouseout = function(){
    this.src = this.src.replace(/_on/i,"_off");
    return false;
   }
  }
 }
}
window.onload = setRollOver;





function EarthQuake(n) {
	if (parent.moveBy) {
		for (i = 1 ; i <5 ; i++) {
			for (j = 1 ; j <= n ; j++) {
				for (k = 1 ; k < 2 ; k++) {
					with (parent) {
						moveBy(0,i);
						moveBy(i,0);
						moveBy(0,-i);
						moveBy(-i,0);
					}
				}
			}
		}
	}
}