function simpleClock(id,start){
 this.id=id;
 this.client_start=new Date();
 if(!start){ start=this.client_start.getTime(); }
 this.server_start=start;
 this.clock=document.getElementById(id);
 if(!this.clock){
  this.clock=document.createElement("div");
  this.clock.setAttribute('id',this.id);
  document.body.appendChild(this.clock);
 }
 var me=this;
 setTimeout(function(){me.tick();},1000);
}
simpleClock.prototype.tick=function(){
 var me=this;
 var now=new Date();
 var elapsed=now-this.client_start;
 var d=new Date();
 d.setTime(this.server_start+elapsed);
 var html='';
 html+=lpad(d.getDate(),2,'0')+"/"+lpad(d.getMonth()+1,2,'0')+"/"+(d.getFullYear())+" ";
 html+=lpad(d.getHours(),2,'0')+":"+lpad(d.getMinutes(),2,'0')+":"+lpad(d.getSeconds(),2,'0');
 this.clock.innerHTML=html;
 setTimeout(function(){me.tick();},1000);
}