docs: function _fnStringToCss( s )
  		{
  			if ( s === null )
  			{
  				return "0px";
  			}
  			
  			if ( typeof s == 'number' )
  			{
  				if ( s < 0 )
  				{
  					return "0px";
  				}
  				return s+"px";
  			}
  			
  			/* Check if the last character is not 0-9 */
  			var c = s.charCodeAt( s.length-1 );
  			if (c < 0x30 || c > 0x39)
  			{
  				return s;
  			}
  			return s+"px";
  		}