// Internet Explorer Document.getElementById() fix.
if ((document.all) && (!document.getElementById)) {
    document.getElementById = function(id)
    {
	return document.all[id];
    }
}


// Populates a Viator Widget div, by using a cross-domain AJAX request (a.k.a.
// <script> tag hack):
// - Find the div with name "viatorWidgetDiv_key" (e.g. "viatorWidgetDiv_1234")
// - Use the content of all child div's whose id starts with "viatorWidgetDiv_key"
//   to construct a URL to retrieve the widget content.
// - Create a <script> element that references the generated URL.
// - Create a callback function, document.viatorCallback_key.
// - When the generated <script> tag finishes loading, it will call the callback
//   function, passing in the generated HTML. The callback function will then
//   add the HTML to the widget div, and make it visible.
function initViatorWidgetDiv(key, paramsId)
{
    var prefix = "viatorWidgetDiv_" + key;
    var url = "?callback=document.viatorWidgetDivCallback_" + key;
    if (!paramsId) {
	paramsId = prefix;
    }

    var paramsDiv = document.getElementById(paramsId);
    var widgetDiv = document.getElementById(prefix);

    for (var i=0; i<paramsDiv.childNodes.length; i++) {
	var node = paramsDiv.childNodes[i];
	if ((node.id) && (node.id.indexOf(prefix) == 0)) {
	    var name = node.id.substring(prefix.length+1);
	    var value = node.innerHTML;

	    if (name == "action") {
		url = value + url;
	    } else {
		url += "&" + name + "=" + escape(value);
	    }
	}
    }

    document['viatorWidgetDivCallback_' + key] = function(html)
    {
	widgetDiv.innerHTML = html;
	widgetDiv.style.display = "block";
    }

    var head = document.getElementsByTagName("head")[0];

    var scriptID = 'viatorWidgetDivScriptTag_' + key;
    var oldScript = document.getElementById(scriptID);
    if (oldScript) {
	oldScript.parentNode.removeChild(oldScript);
    }

    var newScript = document.createElement('script');
    newScript.id = scriptID;
    newScript.type = 'text/javascript';
    newScript.src = url;
    head.appendChild(newScript);
}