// run on pageload
dom_addLoadEvent(FixExternalLinks);

// swaps an image with a specific id to a new image url
function swap(id, url)
{
	var oImg = document.getElementById(id);
	oImg.src = url;
}

// toggle for left menu options
function toggleMainNav(oThisMenuLink)
{
	var oThisMenuLinksArrowImageArray = oThisMenuLink.parentNode.getElementsByTagName("img");
	var oThisMenuLinksArrowImage = oThisMenuLinksArrowImageArray[0];
	var oThisParentContainer = oThisMenuLink.parentNode.parentNode;	
	var arrNavDivs = dom_getElementsByClassName(document, 'div', 'mainnav_mainlevel');

	// close all other submenus
	/*
	for (var i=0; i<arrNavDivs.length; i++)
	{
		if (arrNavDivs[i] !== oThisParentContainer)
		{
			dom_removeClassName(arrNavDivs[i], 'onstate');
		}
	}	
	*/
	
	// open or close (toggle) proper submenu (and title text for arrow image)
	if (!dom_hasClassName(oThisParentContainer, 'onstate'))
	{
		dom_addClassName(oThisParentContainer, 'onstate');
		/*oThisMenuLinksArrowImage.setAttribute('alt', 'click to hide');
		oThisMenuLinksArrowImage.setAttribute('title', 'click to hide'); Irrelevant since switching to background-based arrows. */
	}
	else
	{
		dom_removeClassName(oThisParentContainer, 'onstate');
		/*oThisMenuLinksArrowImage.setAttribute('alt', 'click to expand');
		oThisMenuLinksArrowImage.setAttribute('title', 'click to expand');*/
	}	
}

// toggle for tab content boxes
function toggleTabContent(oThisMenuLink, iTabContentId)
{
	var oThisContentDiv = document.getElementById('tabcontent_' + iTabContentId);
	var arrMenuLinks = dom_getElementsByClassName(document, 'a', 'tabbedboxmenulink');
	var arrContentDivs = dom_getElementsByClassName(document, 'div', 'tabbedboxcontent');

	// close all other content boxes
	for (var i=0; i<arrContentDivs.length; i++)
	{
		if (arrContentDivs[i] !== oThisContentDiv)
		{
			dom_removeClassName(arrContentDivs[i], 'onstate');
		}
	}	

	// open or close (toggle) proper content box
	if (!dom_hasClassName(oThisContentDiv, 'onstate'))
	{
		dom_addClassName(oThisContentDiv, 'onstate');
	}

	// close all other tab links
	for (var i=0; i<arrMenuLinks.length; i++)
	{
		if (arrMenuLinks[i] !== oThisMenuLink)
		{
			dom_removeClassName(arrMenuLinks[i], 'onstate');
		}
	}	

	// open or close (toggle) proper tab link
	if (!dom_hasClassName(oThisMenuLink, 'onstate'))
	{
		dom_addClassName(oThisMenuLink, 'onstate');
	}
	
	return false;
}
// ### General Utility & DOM Handling Functions Below This Line

// ### gets an array of objects that match the input start element, tag name, and class name
// Ways of calling the function are:
// To get all a elements in the document with a “info-links” class. 
// getElementsByClassName(document, "a", "info-links"); 
// To get all div elements within the element named “container”, with a “col” and a “left” class. 
// getElementsByClassName(document.getElementById("container"), "div", ["col", "left"]); 
function dom_getElementsByClassName(oElm, strTagName, oClassNames){
    var arrElements = (strTagName == "*" && document.all)? document.all : 
    oElm.getElementsByTagName(strTagName);
    var arrReturnElements = new Array();
    var arrRegExpClassNames = new Array();
    if(typeof oClassNames == "object"){
        for(var i=0; i<oClassNames.length; i++){
            arrRegExpClassNames.push(new RegExp("(^|\\s)" + 
            oClassNames[i].replace(/\-/g, "\\-") + "(\\s|$)"));
        }
    }
    else{
        arrRegExpClassNames.push(new RegExp("(^|\\s)" + 
        oClassNames.replace(/\-/g, "\\-") + "(\\s|$)"));
    }
    var oElement;
    var bMatchesAll;
    for(var j=0; j<arrElements.length; j++){
        oElement = arrElements[j];
        bMatchesAll = true;
        for(var k=0; k<arrRegExpClassNames.length; k++){
            if(!arrRegExpClassNames[k].test(oElement.className)){
                bMatchesAll = false;
                break;                      
            }
        }
        if(bMatchesAll){
            arrReturnElements.push(oElement);
        }
    }
    return (arrReturnElements)
}

function dom_addClassName(oElm, strClassName)
{
	var strCurrentClass = oElm.className;
	if(!new RegExp(strClassName, "i").test(strCurrentClass)){
		oElm.className = strCurrentClass + ((strCurrentClass.length > 0)? " " : "") + strClassName;
	}
}

function dom_removeClassName(oElm, strClassName)
{
	var oClassToRemove = new RegExp((strClassName + "\s?"), "i");
	oElm.className = oElm.className.replace(oClassToRemove, "").replace(/^\s?|\s?$/g, "");
}

function dom_hasClassName(oElm, strClassName)
{  
	return oElm.className.match(new RegExp('(\\s|^)'+strClassName+'(\\s|$)'));
}

// ### adds a function to run at onLoad
function dom_addLoadEvent(func)
{
	var oldonload = window.onload;
	if (typeof window.onload != 'function')
	{
		window.onload = func;
	}
	else
	{
		window.onload = function()
		{
			oldonload();
			func();
		}
	}
}

function FixExternalLinks()
{
	var objLinks = document.getElementsByTagName('a');
	
	for (var iCounter=0; iCounter<objLinks.length; iCounter++)
	{
		if (objLinks[iCounter].getAttribute('href') && objLinks[iCounter].getAttribute('rel') == 'external')
		{
	        	objLinks[iCounter].setAttribute('target', '_blank');
		}
		else if (objLinks[iCounter].getAttribute('href') && objLinks[iCounter].getAttribute('rel') == 'top')
		{
	        	objLinks[iCounter].setAttribute('target', '_top');
		}
	}
}