function getURLArg( argToFind ) {
	var f = document.forms[0];
    	var query = location.search.substring(1); 	// Get query string.
    	var pairs = query.split("&");          		     // Break at ampersand
    	for(var i = 0; i < pairs.length; i++) {
		var pos = pairs[i].indexOf('='); 			// Look for "name=value".
		if (pos == -1) continue;          	        	// If not found, skip.
		var argname = pairs[i].substring(0,pos);  // Extract the name.
		if( argname ==  argToFind ){
			var value = unescape(pairs[i].substring(pos+1));    // Extract the value.
			return( value )
		}
	}
	return null;
}