//goes through all tabs and hides them.
function closeAllTabs(tab_list)
{
	var lists = document.getElementById(tab_list);
	if (lists)
	{
		var ch = lists.getElementsByTagName("div");
		if (ch)
		{
			for (var i = 0; i<ch.length; i++)
			{
				if (ch[i].id.substring(0,7) == "div_li_")
				{
					ch[i].style.display = "none";
				}
			}
		}
	}
}

/**
 * Attempts to select the tab by setting a classname on the given element and resetting all the other tabs
 * Depends on the css being set for the classname selected
 * Author: philn
 */
function selectItemTab(u_list_id, sel)
{
	var u_list = document.getElementById(u_list_id);
	var items = u_list.getElementsByTagName("li");
	for (it in items)
	{
		if (items[it] && items[it].tagName == "LI")
		{
			var anchor = items[it].getElementsByTagName("a");
			for (key in anchor)
			{
				
				if (anchor[key] && anchor[key].tagName == "A")
				{
					if ( anchor[key].id == sel )
					{
						anchor[key].className = "selected";
						if (items[it].className.substring(0,5) == "first") {
							items[it].className = "first active";							
						}else if (items[it].className.substring(0,4) == "last") {
							items[it].className = "last active";
						}else{
							items[it].className = "active";
						}
					}
					else
					{
						anchor[key].className = "";	

						if (items[it].className.substring(0,5) == "first") {
							items[it].className = "first";							
						}else if (items[it].className.substring(0,4) == "last") {
							items[it].className = "last";
						}else{
							items[it].className = "";
						}
					}
				}
			}
		}
	}
}


/**
 * Attempts to select the tab with ID but if the requested tab
 * does not exist then it will find the first available tab
 * and select that. 
 *
 * Disappearing tabs can happen when the list of tabs changes between
 * page refreshes and the interface needs to select the first available one.
 *
 * Author: peterl
 */
function selectTab(tab_list, id)
{
	/**
	 * Saves the most recent selected tab in this hidden field
	 *
	 * Author: peterl	 
	 */
	//var lists = document.getElementById(tab_list);
	if (document.getElementById("view_pane"))
		document.getElementById("view_pane").value = id;
	
	/**
	 * Deselect all tabs (so no other tabs are open)
	 *
	 * Author: peterl
	 */
	closeAllTabs(tab_list);
	/**
	 * Attempt to make the requested tab visible. If the tab doesn't
	 * exist then find the first available tab and make that visible.
	 *
	 * Author: peterl	 
	 */
	try {
		document.getElementById('div_li_' + id).style.display = '';
	}catch(e) {
		var lists = document.getElementById(tab_list);
		if (lists == null)
		{
			console.error("Error:Lists element is NULL");
		}
		var ch = lists.getElementsByTagName("div");
		for (var i = 0; i<ch.length; i++)
		{
			if (ch[i].id.substring(0,7) == "div_li_")
			{
				ch[i].style.display = '';
				break;
			}
		}
	}
}