function Popup (popupURL,name,w,h) {
	LeftPosition=(screen.width)?(screen.width-w)/2:100;
	TopPosition=(screen.height)?(screen.height-h)/2:100;
	window.open (popupURL,name,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=0,resizable=1,width='+w+',height='+h+',left='+LeftPosition+',top='+TopPosition);
}

function Popup1 (popupURL,name,w,h) {
	LeftPosition=(screen.width)?(screen.width-w)/2:100;
	TopPosition=(screen.height)?(screen.height-h)/2:100;
	window.open (popupURL,name,'toolbar=0,location=0,directories=0,status=0,menubar=0,scrollbars=1,resizable=1,width='+w+',height='+h+',left='+LeftPosition+',top='+TopPosition);
}

function newImage(arg) {
  	if (document.images) {
  		rslt = new Image();
  		rslt.src = arg;
  		return rslt;
  	}
  }
 function noveokno(url) {
  window.open(url, "odpoved", "height=420,width=620,directories=no,location=no," +
                              "menubar=no,resizeable=no,status=no,toolbar=no");
  return false;
 }

  function changeImages() {
	
  	if (document.images && (preloadFlag == true)) {
		
  		for (var i=0; i<changeImages.arguments.length; i+=2) {
  			document[changeImages.arguments[i]].src = changeImages.arguments[i+1];
  		}
  	}
  }  
  var preloadFlag = false;
  function preloadImages() {
  	if (document.images) {
			// index a menu
			horni_menu_spec_on = newImage("pic/index-horni_menu_spec_over.gif");
			horni_menu_prog_on = newImage("pic/index-horni_menu_prog_over.gif");
			horni_menu_div_on = newImage("pic/pic/index-horni_menu_div_over.gif");
			horni_menu_kont_on = newImage("pic/index-horni_menu_kont_over.gif");
			horni_menu_prog_on = newImage("pic/opera-pruhy4-on.gif");
			leve_menu_hledat_on = newImage("pic/index_leve_menu/index_leve_menu_hledat_on.gif");
			leve_menu_rozhled_on = newImage("pic/index_leve_menu/index_leve_menu_rozhled_on.gif");
			leve_menu_objed_on = newImage("pic/index_leve_menu/index_leve_menu_objed_on.gif");
			// specialni
			leve_menu_hudebni_on  = newImage("pic/specialni/b_hudebnifest_over.gif");
			leve_menu_kombinovane_on  = newImage("pic/specialni/b_kombinovane_over.gif");
			leve_menu_specialni_on  = newImage("pic/specialni/b_specialni_over.gif");
			leve_menu_ny_on  = newImage("pic/specialni/b_ny_over.gif");
			// program
			leve_menu_cerna_on  = newImage("pic/specialni/b_cerna_over.gif");
			leve_menu_jazz_on  = newImage("pic/specialni/b_jazz_over.gif");
			leve_menu_koncerty_on  = newImage("pic/specialni/b_koncerty_over.gif");
			leve_menu_laterna_on  = newImage("pic/specialni/b_laterna_over.gif");
			leve_menu_laterna_2_on  = newImage("pic/specialni/b_laterna_2_over.gif");
			leve_menu_muzikaly_on  = newImage("pic/specialni/b_muzikaly_over.gif");
			leve_menu_nd_on  = newImage("pic/specialni/b_nd_over.gif");
			leve_menu_sop_on  = newImage("pic/specialni/b_sop_over.gif");
			leve_menu_staff_on  = newImage("pic/specialni/b_staff_over.gif");
			leve_menu_vino_on  = newImage("pic/specialni/b_vino_over.gif");
			leve_menu_mesic_12_on  = newImage("pic/specialni/b_nesic_12_over.gif");
			leve_menu_rok_2004_on  = newImage("pic/specialni/b_rok_2004_over.gif");
			leve_menu_rok_2005_on  = newImage("pic/specialni/b_rok_2005_over.gif");
			
  		preloadFlag = true; 
}
  }
	
// funkce pojmenovavani ve formech

function textin(path, formname) {
    if (path.value=="") {
        path.value =  formname;
				return true;
    }
}  

function textout(path, formname) {
				if (path.value==formname) {
				path.value = "";
				return true;
		}
}

// kontrola obsahu odesilaneho form
function checkrequired(path, formname,  formcaption) {

if(path.value=='formname'){

		 alert('Prosim vyplòte pole Hledat '+formname+'!');

		 path.focus();

}
else
{
formcaption.submit();
}
}