// toggle press images for a clip
function press_image_toggle(id)
{
	els = getElementsByClassName('hide_press_img');
	for (var i = 0; i < els.length; i++)
		els[i].style.display = 'none';
	document.getElementById(id).style.display = 'block';
}

// these are split out in case they need to be customized at any point
function switch_collab_url(url) { load_url(url); }
function switch_collections_url(url) { load_url(url); }
function switch_stockists_url(url) { load_url(url); }
// generic URL loader
function load_url(url) { window.location.href = url; }

// clear/blur the shop search field if it's just SEARCH
function clear_shop_search(el) { if (el.value == 'Search') { el.value = ''; } }
function blur_shop_search(el) { if (el.value == '') { el.value = 'Search'; } }
function clear_shop_subs(el) { if (el.value == 'Get updates') { el.value = ''; } }
function blur_shop_subs(el) { if (el.value == '') { el.value = 'Get updates'; } }

// show the size comparison chart
function pop_comparison_chart()
{
	window.open("/sizes", "Size Comparison Chart","menubar=0,resizable=1,width=450,height=300");
}

// popup a larger version of the image
function view_larger(img_e)
{
	window.open('/catalog/zoom_image.php?i='+escape(document.getElementById(img_e).src), "","menubar=0,resizable=1,width=100,height=100");
}

// in the store info tabbed box, switch the active tab
function switch_info_tab(type_on, types_off)
{
	for (var z = 0; z < types_off.length; z++)
	{
		document.getElementById('sw_'+types_off[z]).style.display = 'none';
		document.getElementById('tb_'+types_off[z]).className = 'tabby';
	}
	document.getElementById('sw_'+type_on).style.display = 'block';
	document.getElementById('tb_'+type_on).className = 'tabby on';
}

// swap the preview image when viewing product info
function swap_main_img(new_img_src)
{
	document.getElementById('preview_main_image').src = new_img_src;
}

// the following by robert nyman, license: http://code.google.com/p/getelementsbyclassname/
var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
			nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
			returnElements = [],
			current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
			classesToCheck = "",
			xhtmlNamespace = "http://www.w3.org/1999/xhtml",
			namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
			returnElements = [],
			elements,
			node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
			classesToCheck = [],
			elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
			current,
			returnElements = [],
			match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};