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top.setframe("help.html","maindisplay");
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function setframe(relativeurldesired,framelabel) {
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var actualurl = top.baseurl + relativeurldesired;
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top.frames[framelabel].location.href = this.actualurl;
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}
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top is a Netscape(Navigator) object with a property frames which is an array labelled by either integers or by value of name attribute in <frame> name="textofframelabel" </frame> tag
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Setting a URL into location.href property of a frame loads that page into given frame.
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top labels functions defined in page that defines frames
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use this.actualurl to distinguish function's variable actualurl from a global variable of same name
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Put these functions in <head> </head> section so as to ensure they are loaded before anything else
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Addon