var x = 0;
var y = 0;

function init() {
  //if (navigator.appName == "Netscape") { 
  if (document.layers) { 
    document.captureEvents(Event.MOUSEMOVE); 
  }
  document.onmousemove = mouseMove;
}

function mouseMove(e) {
  // if ie 
  if (document.all) {
    x = event.screenX;
    y = event.screenY;
  }
  // if ns
  if (document.layers) {
    x = e.screenX;
    y = e.screenY;
  }
}

function calpopup(frm) {
  x = x + 15; y = y - 10;
  if (x == 15 && y == -10) {
    x = (screen.width - 175)/2;
    y = (screen.height - 218)/2;
  }
  var url = "calendar.aspx?formname=" + frm
  popWin=window.open(url,"calendar_window","width=175,height=235,scrollbars=no,titlebar=no,resizable,screenX="+x+",left="+x+",screenY="+y+",top="+y);

}