/**
 * Automatically detect numbers which use a comma in the place of a decimal 
 * point to allow them to be sorted numerically.
 *  @name Commas for decimal place
 *  @anchor numeric_comma
 *  @author <a href="http://sprymedia.co.uk">Allan Jardine</a>
 */

jQuery.fn.dataTableExt.aTypes.unshift(
	function ( sData )
	{
		var sValidChars = "0123456789-,";
		var Char;
		var bDecimal = false;
		 
		/* Check the numeric part */
		for ( i=0 ; i<sData.length ; i++ )
		{
			Char = sData.charAt(i);
			if (sValidChars.indexOf(Char) == -1)
			{
				return null;
			}
			 
			/* Only allowed one decimal place... */
			if ( Char == "," )
			{
				if ( bDecimal )
				{
					return null;
				}
				bDecimal = true;
			}
		}
		 
		return 'numeric-comma';
	}
);