Q737 How can you retrieve efficiently an images position in the document.images array?
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By looping through the image object looking for an image with a name property equal to the one you are searching for:
<SCRIPT LANGUAGE="JavaScript"><!--
var position = -1;
for (var i=0;i<document.images.length;i++)
if (document.images[i].name == 'thisone') position = i;
//--></SCRIPT>