function getElementByClass(node,classname) 
{  
	if (node.getElementsByClassName)
	{
		// use native implementation if available
		return node.getElementsByClassName(classname);
	}
	else
	{    
		return (function getElementsByClass(searchClass,node)
		{
			if ( node == null )
			node = document;
			var classElements = [],
			els = document.getElementsByTagName("*"),
			elsLen = els.length,
			pattern = new RegExp("(^|\\s)"+searchClass+"(\\s|$)"), i, j;
			
			for (i = 0, j = 0; i < elsLen; i++)
			{
				if ( pattern.test(els[i].className) ) 
				{
					classElements[j] = els[i];
					j++;
				}
			}
			return classElements;
		})(classname, node);  
	}
}