// pop up a window
// version 1.0 20060325
// attaches a click event to any link that is named 'popUp'
// add the pop up parameters as an attribute of the link
// eg <a href="http://adomain.com/popup.htm" target="_blank" name="popUp" popUpParams="width=200,height=400">click here</a>
PW = {
	init : function () {
		PW.popUpWin = 0;
		var aElms = document.getElementsByName('popUp');
		for(var i=0; i<aElms.length; i++) {
			if(aElms[i].tagName.toLowerCase() == 'a') {
				PW.addEvent(aElms[i],'click',PW.popUpWindow);
			}
		}
	},
	popUpWindow : function (e) {
		if (!e) var e = window.event;
		PW.cancelDefault(e);
		var hElm = (e.target) ? e.target : e.srcElement;
		if (hElm.tagName.toLowerCase() == 'img') {
			hElm = PW.getParent(hElm,'a');
		}
		// stop a zillion popups cluttering the screen
		if(PW.popUpWin){
			if(!PW.popUpWin.closed) PW.popUpWin.close();
		}
		var aParam;
		var sParams = hElm.getAttribute('popUpParams');
		if(sParams == '') sParams = hElm.getAttribute('popupParams');
		var aParams = sParams.split(',');
		var oParams = {toolbar:'no',location:'no',directories:'no',status:'no',menubar:'no',scrollbar:'no',resizable:'no',copyhistory:'yes',width:100,height:100,left:null,top:null,screenX:null,screenY:null};
		for(var i=0; i<aParams.length; i++) {
			aParam = aParams[i].split('=');
			oParams[aParam[0]] = aParam[1];
		}
		if (oParams.left==null && oParams.top==null){
			oParams.left = window.screen.availWidth/2 - oParams.width/2;
			oParams.top = window.screen.availHeight/2 - oParams.height/2;
		}
		oParams.screenX = oParams.left;
		oParams.screenY = oParams.top;
		aParams = new Array();
		for(var i in oParams) {
			aParams.push(i+'='+oParams[i]);
		}
		sParams = aParams.join(',');
		PW.popUpWin = window.open(hElm.href, 'popUpWin', sParams);
	},
	addEvent : function (elm, evType, fn, useCapture) {
		// addEvent and removeEvent
		// cross-browser event handling for IE5+,  NS6 and Mozilla
		// By Scott Andrew
		if (elm.addEventListener){
			elm.addEventListener(evType, fn, useCapture);
			return true;
		} else if (elm.attachEvent){
			var r = elm.attachEvent("on"+evType, fn);
			return r;
		} else {
			alert("Handler could not be added");
		}
	},
	cancelDefault : function (e) {
		e.returnValue = false;
		if (e.preventDefault) e.preventDefault();
	},
	getParent : function (el, pTagName) {
		if (el == null) {
			return null;
		} else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase()) {	// Gecko bug, supposed to be uppercase
			return el;
		} else {
			return PW.getParent(el.parentNode, pTagName);
		}
	}
}
PW.addEvent(window,'load',PW.init);