function visByClass(className, state)
{
	if (document.getElementsByTagName) { 
		 var nodes = document.getElementsByTagName("DIV");
		 for (var i = 0;i < nodes.length;i++) {
			var nodeObj = nodes.item(i);
			var attrMax = nodeObj.attributes.length
			for (var j = 0; j < attrMax; j++) {
				if (nodeObj.attributes.item(j).nodeName == 'class') {
					if (nodeObj.attributes.item(j).nodeValue == className) {
						vista = (state) ? 'block'	: 'none';
						nodeObj.style.display = vista;
					 }
				}
			 }
		}
	}
	var nodes = document.getElementsByTagName("SPAN");
		 
	var max = nodes.length
	for (var i = 0;i < max;i++) {
		var nodeObj = nodes.item(i);
		for (var j = 0; j < nodeObj.attributes.length; j++)  {
			if (nodeObj.attributes.item(j).nodeName == 'class') {
				if (nodeObj.attributes.item(j).nodeValue == className) {
					vista = (state) ? 'block'	: 'none';
					nodeObj.style.display = vista;
			 	}
			}
		}
	}
}
	

	function getElementByTagAndName( eltTag, eltName )
	{
		var nodes = document.getElementsByTagName( eltTag );
		var max = nodes.length;
		var result = null;
		
		for (var i = 0;i < max;i++)
		{
			var nodeObj = nodes.item(i);
			for (var j = 0; j < nodeObj.attributes.length; j++)  {
				if (nodeObj.attributes.item(j).nodeName == 'name') {
					if (nodeObj.attributes.item(j).nodeValue == eltName) {
						result = nodeObj;
						i = max;
						break;
					}
				}
			}
		}
		return result;
	}