/**
 * @author	mson@idealistics.org
 * Open a new popup window and centered
 * @param myURL 	the url link to open
 * @param myTarget 	the target window (_blank, whole, etc)
 * @param myWidth	the window width
 * @param myHeight	the window height
 **/
function openNewWin(myURL, myTarget, myWidth, myHeight) {
   var left = (screen.width - myWidth) / 2;
   var top = (screen.height - myHeight) / 2;
   var option = "width = " + myWidth + ", height = " + myHeight + ", top = " + top + ", left=" + left + ", scrollbars=1, resizable=1";
   var newWindow = window.open(myURL, myTarget, option); 
   newWindow.focus();
}