function changeClass(oElement, sClassName) {
  oElement.className = sClassName;
} // end...function

function gotoPage(sLocation) {
  window.location.assign(sLocation);
} // end...function

function isNumberInText(number)  //  boolean function
{
 	var inpstr = "" + number;
  for(var i = 0; i < inpstr.length; i++) {
    var chr = inpstr.charAt(i);
    if( chr < "0" || chr > "9" )
      return false;
  }
  return true;
}

function checkButtons(pageNo, pageNum) {
  bNazaj.disabled = false;
	bNazaj.className = 'button';
	bNaprej.disabled = false;
	bNaprej.className = 'button';			
  if(pageNo <= 1) { 			
		bNazaj.className = 'button-disabled';			
	  bNazaj.disabled = true; 
	}
  if(pageNo >= pageNum) { 
		bNaprej.className = 'button-disabled';			
	  bNaprej.disabled = true; 
	}			
}

function openWindowCentered(sUrl, sHeight, sWidth) {
  nleft = (screen.width / 2) - (sWidth / 2);
	ntop  = (screen.height / 2) - (sHeight / 2);
	
//	alert("top = " + ntop + " left = " + nleft); 
	
  sparams = "height=" + sHeight + ",width=" + sWidth + ",left=" + nleft + ",top=" + ntop;
	sparams = sparams + ",resizable=yes";
//	alert(sparams);
  window.open(sUrl, '_blank', sparams);
 
	return true; 
}