document.write("<div style='text-align: center; color:#005D9B; font-family:comic sans; font-size:12px; padding-top: 3px; font-weight: bold;'>")
      document.write("<span id='cas'>presny cas</span>")
      document.write("</div>")
      
      




var presnycas = 'August 01, 2010 10:57:45'
var datum=new Date(presnycas)

function naplnCas(){
datum.setSeconds(datum.getSeconds()+1)

if (datum.getSeconds() > 9) sekunda = datum.getSeconds();
else  sekunda =  "0" + datum.getSeconds(); 
if (datum.getHours() > 9) hodina = datum.getHours();
else  hodina =  "0" + datum.getHours(); 
if (datum.getMinutes() > 9) minuta = datum.getMinutes();
else  minuta =  "0" + datum.getMinutes(); 
AktualniCas = hodina + ":" + minuta + ":" + sekunda;

document.getElementById("cas").innerHTML = AktualniCas;

}
naplnCas();
window.setInterval("naplnCas()", 1000);