function newWin(url, width) {
	if (width === undefined) {
		width = '300';
	}
  helpWindow = window.open(url,'helpWindow','width=' + width + ',height=400,toolbar=no,location=no,scrollbars=yes,resizable=yes');
  helpWindow.focus();
}

function newWin_big(url) {
  helpWindow = window.open(url,'helpWindow','width=800,height=600,toolbar=no,location=no,scrollbars=yes,resizable=yes');
  helpWindow.focus();
}  

function checkAll(id, num) {
  for (var j = 1; j <= num; j++) {
      document.getElementById(id + "[" + j + "]").checked = true;
  }
}

function uncheckAll(id, num) {
  for (var j = 1; j <= num; j++) {
      document.getElementById(id + "[" + j + "]").checked = false;
  }
}

function switchAll(id, num) {
  for (var j = 1; j <= num; j++) { 
      document.getElementById(id + "[" + j + "]").checked = !document.getElementById(id + "[" + j + "]").checked;
  }
}

function showOrHideDateField(selection) {
  if (selection.options[selection.selectedIndex].value == "time_limit") {
    document.getElementById("expiry_date").style.display = "inline";
  } else {
    document.getElementById("expiry_date").style.display = "none";
  }
}