// Replaces all instances of the given substring.
String.prototype.replaceAll = function( 
	strTarget, // The substring you want to replace
	strSubString // The string you want to replace in.
	){
	var strText = this;
	var intIndexOfMatch = strText.indexOf( strTarget );
	 
	// Keep looping while an instance of the target string
	// still exists in the string.
	while (intIndexOfMatch != -1){
		// Relace out the current instance.
		strText = strText.replace( strTarget, strSubString )
		 
		// Get the index of any next matching substring.
		intIndexOfMatch = strText.indexOf( strTarget );
	}
	 
	// Return the updated string with ALL the target strings
	// replaced out with the new substring.
	return( strText );
}