function itxcheck(element,deftext,mode) {
  if (mode) {
    if (element.value==deftext) element.value = "";
  } else {
    if (element.value=="") element.value = deftext;
  }
}



function getposOffset(overlay, offsettype){
var totaloffset=(offsettype=="left")? overlay.offsetLeft : overlay.offsetTop;
var parentEl=overlay.offsetParent;
while (parentEl!=null){
totaloffset=(offsettype=="left")? totaloffset+parentEl.offsetLeft : totaloffset+parentEl.offsetTop;
parentEl=parentEl.offsetParent;
}
return totaloffset;
}

function getPageScroll(){

	var yScroll;

	if (self.pageYOffset) {
		yScroll = self.pageYOffset;
	} else if (document.documentElement && document.documentElement.scrollTop){	 // Explorer 6 Strict
		yScroll = document.documentElement.scrollTop;
	} else if (document.body) {// all other Explorers
		yScroll = document.body.scrollTop;
	}

	arrayPageScroll = new Array('',yScroll) 
	return arrayPageScroll;
}

// -----------------------------------------------------------------------------------

//
// getPageSize()
// Returns array with page width, height and window width, height
// Core code from - quirksmode.org
// Edit for Firefox by pHaez
//
function getPageSize(){
	
	var xScroll, yScroll;
	
	if (window.innerHeight && window.scrollMaxY) {	
		xScroll = document.body.scrollWidth;
		yScroll = window.innerHeight + window.scrollMaxY;
	} else if (document.body.scrollHeight > document.body.offsetHeight){ // all but Explorer Mac
		xScroll = document.body.scrollWidth;
		yScroll = document.body.scrollHeight;
	} else { // Explorer Mac...would also work in Explorer 6 Strict, Mozilla and Safari
		xScroll = document.body.offsetWidth;
		yScroll = document.body.offsetHeight;
	}
	
	var windowWidth, windowHeight;
	if (self.innerHeight) {	// all except Explorer
		windowWidth = self.innerWidth;
		windowHeight = self.innerHeight;
	} else if (document.documentElement && document.documentElement.clientHeight) { // Explorer 6 Strict Mode
		windowWidth = document.documentElement.clientWidth;
		windowHeight = document.documentElement.clientHeight;
	} else if (document.body) { // other Explorers
		windowWidth = document.body.clientWidth;
		windowHeight = document.body.clientHeight;
	}	
	
	// for small pages with total height less then height of the viewport
	if(yScroll < windowHeight){
		pageHeight = windowHeight;
	} else { 
		pageHeight = yScroll;
	}

	// for small pages with total width less then width of the viewport
	if(xScroll < windowWidth){	
		pageWidth = windowWidth;
	} else {
		pageWidth = xScroll;
	}

	arrayPageSize = new Array(pageWidth,pageHeight,windowWidth,windowHeight) 
	return arrayPageSize;
}

function popupKomunikat(txt) {
  var m2 = document.getElementById("popup_komunikat_txt");
  if (m2) m2.innerHTML = txt;
  showPopup("komunikat","_center");
}

function closePopup() {
  if (currentPopup!="") {
    var m1 = document.getElementById("popup_"+currentPopup);
    var m1b = document.getElementById("popup_"+currentPopup+"_bk");
    if (m1) m1.style.top = "-5000px";
    if (m1b) m1b.style.top = "-5000px";    
  }
}

function showMessage(msg)
{
  popupKomunikat(msg);
}

function hideMessage()
{
  closePopup();
}

var currentPopup = "";

function showPopup(which,mode) {
  if (currentPopup!=which) closePopup();
  var m1 = document.getElementById("popup_"+which);
  var m1b = document.getElementById("popup_"+which+"_bk");
  if (m1&&m1b) {
    var t = "324px";
    var l = "50%";
    if (mode=="_center") {
      var pagesize = getPageSize();
      var pagescroll = getPageScroll();
      t = pagescroll[1] + Math.floor(pagesize[3] / 2) - 115;
      var tb = t - 10;
      t += "px";
      tb += "px";
    } else if (mode=="_top") {
    } else {
      var m2 = document.getElementById(mode);
      if (m2) {
        var l=(getposOffset(m2, "left")-4)+"px";
        var t=(getposOffset(m2, "top")+20)+"px";
      }
    }
    m1.style.left = l;
    m1b.style.left = l;
    m1.style.top = t;
    m1b.style.top = tb;
    currentPopup = which;
  }
}

function getImage(file)
{
  document.getElementById('img').src="includes/thumbnail.php?fileName="+file+"&size=168";
  document.getElementById('href').href=file;
}