function toggleLayer( whichLayer )
{
  var elem, vis;
  if( document.getElementById ) 
    elem = document.getElementById( whichLayer );
  else if( document.all ) 
      elem = document.all[whichLayer];
  else if( document.layers ) 
    elem = document.layers[whichLayer];
  vis = elem.style;

  if(vis.display==''&&elem.offsetWidth!=undefined&&elem.offsetHeight!=undefined)    vis.display = (elem.offsetWidth!=0&&elem.offsetHeight!=0)?'block':'none';  vis.display = (vis.display==''||vis.display=='block')?'none':'block';
}



		function CheckCallBackForm()
		{
 
			var title = document.getElementById("title");
			var short = document.getElementById("short");
			var category = document.getElementById("category");
			var url = document.getElementById("url");
			var FirmName = document.getElementById("FirmName");
			var CityFirm = document.getElementById("CityFirm");
			var FirmAddress = document.getElementById("FirmAddress");
			var FirmPhone = document.getElementById("FirmPhone");
			var FirmMail = document.getElementById("FirmMail");
						
			var dropdownIndex = document.getElementById('category').selectedIndex;
			var dropdownValue = document.getElementById('category')[dropdownIndex].value;
			//alert(dropdownValue);
			
			if(dropdownValue == -1) {
				alert('Моля изберете категория.');
				category.focus();
				return false;}			
			if(title.value == '') {
				alert('Моля въведете валидно заглавие за Вашата публикация.');
				title.focus();
				return false; }
			if(short.value == '') {
				alert('Моля въведете валидно кратко описание за Вашата публикация.');
				short.focus();
				return false; }
			if(url.value == '') {
				alert('Моля, въведете уеб страница.');
				url.focus();
				return false; }
			if(FirmName.value == ''){
				alert('Моля, въведете име на фирма.');
				FirmName.focus();
				return false; }
			if(CityFirm.value == '') {
				alert('Моля, въведете град.');
				CityFirm.focus();
				return false; }			
			if(FirmAddress.value == '') {
				alert('Моля, въведете адрес.');
				FirmAddress.focus();
				return false; }
			if(FirmPhone.value == '') {
				alert('Моля, въведете телефон.');
				FirmPhone.focus();
				return false; }
			if(FirmMail.value == '') {
				alert('Моля, въведете имейл адрес.');
				FirmMail.focus();
				return false; }

			toggleLayer('formbox');
			toggleLayer('loadingbox');
			// Everything is OK
			return true;
		}