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<form name=forms>
  <font size=3>
  <CENTER>
    <div align=center></font><font color=red size=3>您在本页停留了</font><font color=#80FF80>
      <input type=text name=input1 size=10>
      </font> </div>
  </center>
  </font> 
  <SCRIPT language=javascript><!--

var sec=0;var min=0;var hou=0;flag=0;idt=window.setTimeout("update();",1000);
function update(){
	sec++;
	if(sec==60){sec=0;min+=1;}
	if(min==60){min=0;hou+=1;}
	if((min>0)&&(flag==0)){window.alert("你已经在本页停留了1分钟!");flag=1;}

	//document.forms.input1.value=hou+"时"+min+"分"+sec+"秒";idt=window.setTimeout("update();",1000);
	var isTime=hou+"时"+min+"分"+sec+"秒";idt=window.setTimeout("update();",1000);
	document.forms.input1.value=isTime;
	document.getElementById("a1").innerHTML=isTime;
}

//-->

</SCRIPT>
</form>

<div id="a1">a1</div>