function getElementsByClass(searchClass,node,tag) {
	var classElements = new Array();
	if ( node == null )
		node = document;
	if ( tag == null )
		tag = '*';
	var els = node.getElementsByTagName(tag);
	var elsLen = els.length;
	var pattern = new RegExp("(^|\\\\s)"+searchClass+"(\\\\s|$)");
	for (i = 0, j = 0; i < elsLen; i++) {
		if ( pattern.test(els[i].className) ) {
			classElements[j] = els[i];
			j++;
		}
	}
	return classElements;
}

function hideAllDivs(){ 
	var arrayOfDivs = getElementsByClass("error");
	for (var i=0; i<arrayOfDivs.length; i++) {
		arrayOfDivs[i].style.display="none"; 
	}
}

function show(id) {
	 obj = document.getElementById(id); 
	 obj.style.display = "block"; 
}

function hide(id) {
	 obj = document.getElementById(id); 
	 obj.style.display = "none"; 
}