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In Internet Explorer 4+:
<script language="JavaScript"><!-- function height() { if (document.all) alert('Document height = ' + document.body.offsetHeight); } //--></script>
If you must have the height in Netscape Navigator then include the complete page contents in a layer:
<html> <head> <script language="JavaScript"><!-- function height() { if (document.all) alert('Document height = ' + document.body.offsetHeight); else if (document.layers) alert('Document height = ' + document.body.document.height); } //--></script> </head> <body onLoad="height()"> <ilayer id="body"> *** Place your page contents in here *** </ilayer> </body> </html>