var inprogress = 0;
		var allow_extensions = /(jpg|jpeg|gif|bmp|png|tiff)$/i;
		ii1 = new Image();ii1.src = "pb.gif";

		function resetForm(){
			window.location.reload();
		}
		function linkUpload(){
			if(inprogress==1) { return false; }
			if(checkNullFileCount()){ return false; }
			if(checkAllowFileExtensions()){ return false; }
			
			inprogress = 1;
			$("progress_bar").innerHTML =  '<img src="pb.gif" border="0" /><br/>proszę czekać... &nbsp; ';
			$("upload_button").style.display = 'none';
			$("reset_button").style.display = '';
		}
		
		function checkAllowFileExtensions(){
			if(document.form_upload.elements['upfile'].value != ""){
				if(!document.form_upload.elements['upfile'].value.match(allow_extensions)){
					var string = document.form_upload.elements['upfile'].value;
					var num_of_last_slash = string.lastIndexOf("\\");
					
					if(num_of_last_slash < 1){ num_of_last_slash = string.lastIndexOf("/"); }
					var file_name = string.slice(num_of_last_slash + 1, string.length);
					var file_extension = file_name.slice(file_name.indexOf(".")).toLowerCase();
					
					alert('Niedozwolone rozszerzenie: ' + file_extension );
					return true;
					}
				}
			return false;
		}

		function checkNullFileCount(){
			var null_file_count = 0;
			
			if(document.form_upload.elements['upfile'].value != ""){ null_file_count++; }

			if(null_file_count < 1){
				alert("Wybierz plik do wgrania.");
				return true;
			}
			else{ return false; }
		}
		
		function hideall(){
			var Nodes=document.getElementsByTagName("div")
			var max=Nodes.length
			for(var i=0;i<max;i++){
				var nodeObj=Nodes.item(i)
				var str=nodeObj.id
				if(str.match("backgrounds")){nodeObj.style.display='none';}
			}
		}

		function setPage(includer,bigger){
			var page = parseInt($("curPage").value)+1;
			if(page>2) page=0;
			
			$("curPage").value=page;
			
			if(!$("backgrounds"+page)){
				var req = mint.Request();
				req.AddParam("page",page);
				req.AddParam("includer",includer);
				req.AddParam("bigger",bigger);
				
				req.OnSuccess = function() {
					hideall();
					$("sampleBG").innerHTML += this.responseText;
				}
				req.Send("startFFAJAX.php");
			}else{
				hideall();
				$("backgrounds"+page).style.display='';
			}
		}