function kill(){
	getElem("mbck").style.visibility = "hidden";
	getElem("lst").style.visibility = "hidden";
}
getElem("crs10").onmouseover = function(){
	getElem("mbck").style.visibility = "visible";
	getElem("lst").style.visibility = "visible";
}
getElem("mbck").onblur = function(){
	kill();
}