var isNN = (navigator.appName.indexOf("Netscape")!=-1);

function autoTab(input,e) {
  var keyCode = (isNN) ? e.which : e.keyCode; 
  var filter = (isNN) ? [0,8,9] : [0,8,9,16,17,18,37,38,39,40,46];
  
  len = input.maxLength;
  
  if(input.value.length >= len && !containsElement(filter,keyCode)) {
    input.value = input.value.slice(0, len);
    input.form[(getIndex(input)+1) % input.form.length].focus();
  }

  function containsElement(arr, ele) {
    var found = false, index = 0;
    while(!found && index < arr.length)
    if(arr[index] == ele)
    found = true;
    else
    index++;
    return found;
  }

  function getIndex(input) {
    var index = -1, i = 0, found = false;
    while (i < input.form.length && index == -1)
    if (input.form[i] == input)index = i;
    else i++;
    return index;
  }
  return true;
}

function isNum(num){
	if(isNaN(num.value))num.value = num.value.substr(0,num.value.lenght-1);
}

function popup(page,name,width,height,scrollbar,statusbar){
	if(width == "")width = 700;
	if(height == "")height = 475;	
	
	winl = (screen.width - width) / 2;
	wint = (screen.height - height) / 2;
	
	newWin = window.open(page,name,"toolbar=no,location=no,directories=no,status=no,menubar=no,scrollbars="+scrollbar+",resizable=no,copyhistory=yes,width="+width+",height="+height+",left="+winl+",top="+wint+",screenX="+winl+",screenY="+winl);
	newWin.focus();
	void(0);
}