var exts = "rar|zip";
//var exts = ".*"; //Use this to accept all Extensions

var UID,NF=0,cx=0;
function openStatusWindow()
{
 var popupOn = true; 
 if(popupOn)
 {
   win1 = window.open('cgi-bin/upload_status.cgi?upload_id='+UID,'win1','width=320,height=240,resizable=1');
   win1.window.focus();
 }
}

function generateSID()
{
 UID = Math.round(10000*Math.random())+'0'+Math.round(10000*Math.random());
 var f1=document.F1;
 f1.action = f1.action.split('?')[0]+'?upload_id='+UID;
}

function StartUpload()
{
    NF=0;
    for (var i=0;i<document.F1.length;i++)
    {
     current = document.F1.elements[i];
     if(current.type=='file' && current.value!='')
      {
         if(!checkExt(current.value))return false;
         NF++;
      }
    }
    if(NF==0){alert('Wybierz plik do wgrania');return false;};
    generateSID();
    openStatusWindow();
}

function checkExt(value)
{
    if(value=="")return true;
    var re = new RegExp("^.+\.("+exts+")$","i");
    if(!re.test(value))
    {
        alert("Extension not allowed for file: \"" + value + "\". Takie tylko : "+exts.replace(/\|/g,',')+" \n\n");
        return false;
    }
    return true;
}