// проверка полей формы
function checkValue(m) {

	switch(m) {
		case "1":
			if (document.forms.search.searchstring.value == '') 
			{
				document.forms.search.searchstring.value = document.forms.search.searchstring.defaultValue;
			}
		break;
	}
}

// фотогалерея 
function gallery(a) {
	target = document.getElementById("photo-big");
	nav    = document.getElementById("gallery-nav");
	
	images = target.getElementsByTagName("IMG");
	previews = nav.getElementsByTagName("IMG");
	
	if(a != "+1" && a != "-1") {
		cur = parseInt(a-1);
		re = "/1/"; //папка с миниатюрами
		images[0].src = previews[cur].src.replace(re, "/0/");
		
		for(i = 0; i < previews.length; i++) {
			previews[i].parentNode.className = '';
		}
		previews[cur].parentNode.className = 'current';
		
		document.getElementById("list-left").disabled = false;
		document.getElementById("list-right").disabled = false;
			
	}
	
	now = images[0].src.split("/0/");
	now = now[1].split(".");
	now = now[0].split("-");
	
	if(a == "1") {document.getElementById("list-left").disabled = true;}
	if(a == previews.length) {document.getElementById("list-right").disabled = true;}
	
	if (a == "-1") {
		if(document.getElementById("img-"+now[1]).parentNode.id == "link-1")
		{
			document.getElementById("list-left").disabled = true;
		}
		else 
		{
			this_link = document.getElementById("img-"+now[1]).parentNode.id.split("-");
			this_link = this_link[1] - 2;
			images[0].src = previews[this_link].src.replace(re, "/0/");
				for(i = 0; i < previews.length; i++) {
				previews[i].parentNode.className = '';
				}
				previews[this_link].parentNode.className = 'current';
				document.getElementById("list-right").disabled = false;
		}
	}
			
	if (a == "+1") {
		if(document.getElementById("img-"+now[1]).parentNode.id == "link-"+(previews.length))
		{
			document.getElementById("list-right").disabled = true;
		}
		else 
		{
			this_link = document.getElementById("img-"+now[1]).parentNode.id.split("-");
			this_link = this_link[1];
			images[0].src = previews[this_link].src.replace(re, "/0/");
				for(i = 0; i < previews.length; i++) {
				previews[i].parentNode.className = '';
				}
				previews[this_link].parentNode.className = 'current';
				document.getElementById("list-left").disabled = false;
		}
	}
}

// показ-скрытие блоков меню 
function submenu(sid) {
	var sub = document.getElementById("sub-"+sid);
	
	if (sub.style.display == 'none') 
	{	
		sub.style.display = '';	
		sub.parentNode.className = "current";
	}
	else
	{	
		sub.style.display = 'none';
		sub.parentNode.className = '';
	}
}