function ShowElementsWithClassName(elementName,className) {
    var allElements = document.getElementsByTagName(elementName);
    for (var i = 0; i< allElements.length; i++) {
 		if (hasClass(allElements[i], className)) {
     		allElements[i].style.display='block';
 		}
    }
}

function HideElementsWithClassName(elementName,className) {
    var allElements = document.getElementsByTagName(elementName);
    for (var i = 0; i< allElements.length; i++) {
 		if (hasClass(allElements[i], className)) {
     		allElements[i].style.display='none';
 		}
    }
}

function hasClass(ele,cls) {
	return ele.className.match(new RegExp('(\\s|^)'+cls+'(\\s|$)'));
}