rem: while ($type(el) == 'whitespace') el = el[brother]; 
add: while (el && $type(el) != 'element') el = el[brother]; 
context: 	walk: function(brother, start){		brother += 'Sibling';		var el = (start) ? this[start] : this[brother];		while ($type(el) == 'whitespace') el = el[brother];		return $(el);	},
meta: 6317	/local1/tlutelli/issta_data/temp/all_js/javascript/2007_temp/2007/6317/d93603328e017c1d5014ce905069d4d65b792e85/Element.js/buggy/Native/Element.js