function checkQuery() {
  var form = document._AdvancedSearch;
  var len1 = form.Field_1.value.length;
  var len2 = form.Field_2.value.length;
  var len3 = form.Field_3.value.length;
  var len4 = form.Search_All.value.length;
   
  if (len1 == 0 && len2 == 0 && len3 == 0 && len4==0) {
   alert("Není zadáno žádné klíčové slovo pro hledání!");
   form.Field_1.focus();
    return false; 
 }	 
     
 return checkAll("_AdvancedSearch","DBSources");
}
function checkAll(FormName, FieldName){
	var objCheckBoxes = document.forms[FormName].elements[FieldName];
	
	for(var i = 0; i < document.forms[FormName].count.value; i++)
			if (objCheckBoxes[i].checked) return true;
			
	alert("Zaškrtnite prosím alespoň jednu databázi...!");	
	return false;
}
var newwindow;
function poptastic(url)
{
var leftPos = 0;
var topPos = 0;
if (screen) {
leftPos = (screen.width / 2) - 251;
topPos = (screen.height / 2) - 162;
}
	newwindow=window.open(url+"&PCode="+document.forms[0].lastFocus.value,'name','height=500,width=500,resizable=yes,scrollbars=yes,top='+topPos+',left='+leftPos);
	if (window.focus) {newwindow.focus()
}		
	
}
function pophelp(url)
{
var leftPos = 0;
var topPos = 0;
if (screen) {
leftPos = (screen.width / 2) - 251;
topPos = (screen.height / 2) - 162;
}
	newwindow=window.open(url,'name','height=500,width=500,resizable=yes,scrollbars=yes,top='+topPos+',left='+leftPos);
	if (window.focus) {newwindow.focus()}	
	
}
function focusOnMe(index){
document.forms[0].lastFocus.value = "Field_"+index;
}
function reset() 
  { 
    for (var i = 0; i< document.form1.elements.length; i++) { 
      if (document.form1.elements[i].name == "request") { 
         document.form1.elements[i].value = ""; 
      } 
    } 
  }