function getClass(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 show(iid)
{
	items = getClass("post",document,"div");
	backtops = getClass("back-top",document,"div");
	pictures= getClass("cpictures",document,"li");
	if (iid=="all") {
		for(i=0;i< items.length;i++) {
			items[i].style.display="block";
		}

		for(i=0;i< backtops.length;i++) {
			backtops[i].style.display="block";
		}

		for(i=0;i< pictures.length;i++) {
			pictures[i].style.display="block";
		}
	} else {
		for(i=0;i< items.length;i++) {
			items[i].style.display="none";
		}
		for(i=0;i< backtops.length;i++) {
			backtops[i].style.display="none";
		}
		for(i=0;i< pictures.length;i++) {
			pictures[i].style.display="none";
		}

		toShow = document.getElementById(iid);
		toShow.style.display = "block";
	}
}