function VendorPopup() {

      var vendorID = document.forms[0].ctl00_MainBody_ddlVendor[document.forms[0].ctl00_MainBody_ddlVendor.selectedIndex].value;
      var visitID = document.forms[0].ctl00_MainBody_ddlVisit[document.forms[0].ctl00_MainBody_ddlVisit.selectedIndex].value;
      var state = document.forms[0].ctl00_MainBody_ddlStates[document.forms[0].ctl00_MainBody_ddlStates.selectedIndex].value;
      var siteID = document.forms[0].ctl00_MainBody_ddlSite[document.forms[0].ctl00_MainBody_ddlSite.selectedIndex].value;
      var windowWidth = '500';
      var windowHeight = '580';
      var int_windowLeft = (screen.width - windowWidth) / 2;
      var int_windowTop = (screen.height - windowHeight) / 2;
      var str_windowProperties = 'height=' + windowHeight + ',width=' + windowWidth + ',top=' + int_windowTop + ',left=' + int_windowLeft + ',scrollbars=0,resizable=0,menubar=0,toolbar=0,location=0,statusbar=1,fullscreen=0';
      var obj_window = window.open('VendorPopup.aspx?visitID=' + visitID + '&state=' + state + '&siteID=' + siteID + '&Popup=1&vendorID=' + vendorID, 'Vendors', str_windowProperties)
        if (parseInt(navigator.appVersion) >= 4) {
          obj_window.window.focus();
        }
}