function GetTime() { 
 var dt = new Date();
 var def = dt.getTimezoneOffset()/60;
 var gmt = (dt.getHours() + def);
 var ending = ":" + IfZero(dt.getMinutes()) + ":" +  IfZero(dt.getSeconds());
 var prague =check24(((gmt + 2) > 24) ? ((gmt + 2) - 24) : (gmt + 2));
 document.clock.prague.value = (IfZero(prague) + ending);

 setTimeout("GetTime()", 1000);
 }
 function IfZero(num) {
 return ((num <= 9) ? ("0" + num) : num);
 }
 function check24(hour) {
 return (hour >= 24) ? hour - 24 : hour;
 }