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Attempt to create a layer - then check for its existence - only possible in Netscape Navigator 4+:
<html> <head> <script language="JavaScript"><!-- function test(object) { if (document.layers) if (!document.layers['myId']) location.href = 'turnCSSon.htm'; } //--></script> </head> <body onLoad="test()"> <div id="myId" style="position: absolute; visibility: hidden;"></div> </body> </html>