function showHelp_ (index) {
	trs =  document.getElementsByTagName("table");
	rIndex = 0;
	// alert(trs.length)
	for(i = 0; i < trs.length; i++) {
		if(trs[i].className.toLowerCase() == "displaynone" 
			|| trs[i].className.toLowerCase() == "displayshow") {
			// alert(trs[i].className);
			trs[i].className = "displayNone";
			rIndex ++;
			if(index == rIndex) {
				trs[i].className = "displayShow";
			}
		}
		
	}
}