function check_form(form) 
{
	form4 = "photoform"
	
	var CtgID    = photoform.CtgID.value;
	var PtImage  = photoform.PtImage.value;
	var PtName     = photoform.PtName.value;
	var PtDescription = photoform.PtDescription.value;
	var PtKeywords        = photoform.PtKeywords.value;
	
	var alertX = "";
	
	if  (CtgID == "")     var empty1 = "- Category\n ";     else empty1 = "";
	if  (PtImage == "")   var empty2 = "- Photo - file\n ";  else empty2 = "";
	if  (PtName == "")      var empty3 = "- Name of the photo\n ";          else empty3 = "";
	if  (PtDescription == "")  var empty4 = "- Photo description\n "; else empty4 = "";
	if  (PtKeywords == "")         var empty5 = "- Keywords\n ";                 else empty5 = "";
	

	if (CtgID == "" || PtImage == "" || PtName == "" || PtDescription == "" || PtKeywords == "") 
	{
		alert("Please fill up all required fields:      \n " + empty1 + empty2 + empty3 + empty4 + empty5);
		return false;
	}	
	
	if(alertX == ""){ return true; }
	else{ alert(alertX); return false; }
}