<SCRIPT LANGUAGE="Javascript"> var x = 10 var y = 1 function startClock(){ x = x-y document.frm.clock.value = x setTimeout("startClock()", 1000) if(x==0){ alert("BOOM"); x=10; } }</SCRIPT><BODY BGCOLOR="#FFFFFF" onLoad="startClock()">This page will explode in <FORM NAME="frm"><INPUT TYPE="TEXT" NAME="clock" SIZE=4 >