Zaphod

openedTab = false;http_request = false;destinationLayer = '';function navigate(activeTab, panelName){    for (t = 0; t < 5; t++)    {		if (t == activeTab)		{            /* This if prevents a user from clicking on an already 'opened' tab,            so it doesn't generate unnecessary XHR's.*/                        if ((document.getElementById('TD' + t).style.backgroundImage != 'url(img/darkTab.gif)') || !openedTab)            {                openedTab = true;                                document.getElementById('TD' + t).style.backgroundImage='url(img/darkTab.gif)';                document.getElementById('TD' + t).style.cursor='text';                                                retrieveData(panelName + 'Main', 'http://localhost:8080/dbwtk/code/echoTabs.php', 'POST', true, 'tab=' + t, 'setLayerContent');                                retrieveData(panelName + 'Buttons', 'http://localhost:8080/dbwtk/code/echoButtons.php', 'POST', true, 'tab=' + t, 'setLayerContent');            }		}		else		{			document.getElementById('TD' + t).style.backgroundImage='url(img/lightTab.gif)';            document.getElementById('TD' + t).style.cursor='pointer';		}    }}function retrieveData(toLayer, requestURL, requestMethod, requestAsynchronous, requestData, returnFunction){    http_request = false;    destinationLayer = toLayer; // Defines the value of this global so the right layer is populated        if (window.XMLHttpRequest)    {        http_request = new XMLHttpRequest();                if (http_request.overrideMimeType)        {            http_request.overrideMimeType('text/xml');        }    }    else if (window.ActiveXObject)    {        try        {            http_request = new ActiveXObject("Msxml2.XMLHTTP")        }        catch(e)        {            try            {                http_request = new ActiveXObject("Microsoft.XMLHTTP")            }            catch(e)            {            }        }    }        if (!http_request)    {        alert('Your browser is not equiped to use this tool.');    }        http_request.onreadystatechange = eval(returnFunction);    http_request.open(requestMethod, requestURL, requestAsynchronous);    http_request.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');    http_request.send(requestData);}function setLayerContent(){    functionStatus = false;        xmlReturn = '';    	if (http_request.readyState == 4)	{		if (http_request.status == 200)		{			xmlReturn = http_request.responseText;            functionStatus = true;                        alert(http_request.responseText);		}		else		{			alert('AJAX request error.');            functionStatus = false;		}	}	    document.getElementById(destinationLayer).innerHTML = xmlReturn;		return functionStatus;}