function onl() {
   clearInps();
}

function clearInps(){
  var log = document.getElementById('log'); 
  var inps = log.getElementsByTagName('input');  
  
  var i1 = inps[0].value;
  var i2 = inps[1].value;
      
  inps[0].onclick = function(){if(this.value==i1){this.value=''}}  
  inps[0].onblur = function(){if(this.value==''){this.value=i1}} 
  
  inps[1].onclick = function(){if(this.value==i2){this.value=''}}  
  inps[1].onblur = function(){if(this.value==''){this.value=i2}}      
    
}
window.onload = onl;

// POPUP
function popup (adr, szer, wys){

      var iH = window.innerHeight;
      var iW = window.innerWidth;

      if (!iH){
         var wh = document.body.clientHeight/2;
      } else {
         var wh = iH/2;
      }

      if (!iW){
         var ww = document.body.clientWidth/2;
      } else {
         var ww = iW/2;
      }
      
      var h = wh - (wys/2);
      var w = ww - (szer/2);

   noweOkno = window.open(adr ,'okno' , 'width='+szer+', height='+wys+', top='+h+', left='+w+', menubar=no, status=no, locationbar=no, scrollbars=no, resizeable=no');

}