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How to read local file and echo to innerHTML?

I want a function that reads a local (server side) file and then drops the content into a div on the main html page. Something isn't working, and I'm not sure what. The code is here, the file 'itworks.html' just has the words 'It works!'

Thanks.

<html>
<head>
</head>
</body>
<script language='javascript'>
function readAndEcho(pat) 
{
	fh = fopen(pat, 0); 		// Open the file for reading
	if(fh!=-1) 							// If the file has been successfully opened
	{
	    length = flength(fh);         	// Get the length of the file    
	    str = fread(fh, length);     	// Read in the entire file
	    fclose(fh);                    	// Close the file
	    
	    // Return the contents of the file    
		return str;
	}
}
</script>
<a href="javascript:void(0)" onClick="document.getElementById('content').innerHTML=readAndEcho('itworks.html')">Click</a>
 
<div id='content'></div>
 
</body>
</html>

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