/* Event handling function (allows us to avoid inline event handlers) */
function handleEvent(obj, event, func) {
    try {
        obj.addEventListener(event, func, false);
    } catch (e) {
        if (typeof obj['on'+event] == "function") {
            var existing = obj['on'+event];
            obj['on'+event] = function () { existing(); func(); };
        } else {
            obj['on'+event] = func;                        
        }
    }
}

/* Gets elements by class name */
function getElementsByClassName(node, classname) {
    var a = [];
    var re = new RegExp('(^| )'+classname+'( |$)');
    var els = node.getElementsByTagName("*");
    for(var i=0,j=els.length; i<j; i++)
        if(re.test(els[i].className))a.push(els[i]);
    return a;
}

/* Returns a named variable from a query string */
function getQueryVariableFromString(variable, string) {
	var query = string.split("?")[1];
	var vars = query.split("&");
	for (var i=0;i<vars.length;i++) {
		var pair = vars[i].split("=");
		if (pair[0] == variable) {
			return pair[1];
		}
	}
	alert('Query Variable ' + variable + ' not found');
}

function popLinks() {
	var popLinks = getElementsByClassName(document, "pop-link");
	for (i=0; i<popLinks.length; i++) {
		handleEvent(
			popLinks[i],
			"click",
			function() {
				var href = this.href;
				var d = getQueryVariableFromString("d", href);
				var w = d.split("x")[0];
				var h = d.split("x")[1];
				this.href = "?";
				window.open(href,"pop","width="+w+",height="+h+",scrollbars=no");
			}
		)
	}
}


handleEvent(window, "load", popLinks);