Stub API to Get z-index Property

// cross-platform API for getting zIndex property
function getZIndex(objectName) {
   var theObj
   if (isNav4) { theObj = 
       eval("document." + objectName) }
   if (isIE4)  { theObj = 
       eval("document.all." + objectName + ".style") }
   if (theObj) return theObj.zIndex
}

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