var mins,h;
function TimeStart()
{
 mins=parseInt(document.all["mins"].value);
 h=parseInt(document.all["hrs"].value);
 setTimeout("TimeGo()",60000);
}

function TimeGo()
{
 var timeStr="";
 mins+=1;

 if((mins-60)>=0){
  mins=0;
  h+=1;
 }

 if((h-24)>=0)
  h=0;

timeStr=h+":";

if(mins<10)
  timeStr+="0"+mins;
else
 timeStr+=mins;

 document.all["myTime"].innerHTML=timeStr;
 setTimeout("TimeGo()",60000);
}