// Author: James Craig

// a few browser sniffs to account for known bugs
var sUserAgent = navigator.userAgent.toLowerCase();
var isIE = document.all?true:false;
var isOp = (sUserAgent.indexOf('opera')!=-1)?true:false;

// make new popup window
function pop(oAnchor,sProps,sWindow){
	var sUrl = '';

	// get URL from calling link oAnchor
	if(oAnchor.getAttribute) sUrl = oAnchor.getAttribute('href');
	if(sUrl=='') sUrl = oAnchor.href;

	// if still no URL, return true and let the regular link take over
	if(sUrl=='') return true;

	// set window name ('_blank' for new window each time)
	var sWindowName = sWindow?sWindow:'reusedWindow';

	// sets default properties if none are defined in the function call optional variable 'sProps'
	if(!sProps) sProps = 'width=384,height=288,scrollbars,resizable,toolbar,status,menubar,location';

	// assign the popup to this variable so we can verify it exists
	if(sUrl) var oPopup = window.open(sUrl,sWindowName,sProps);

	// An Opera bug returns too early if you focus the window, so we don't focus it in that browser.
	// Only a noticable defect if a window is already open and hidden.
	if(oPopup && !isOp) oPopup.focus();

	// If popup was created successfully, cancel link in calling window.
	// Acts as regular link in browser that has popup blocking enabled or JavaScript turned off.
	return (oPopup)?false:true;

}

// switch an image src without preloading and leave it
function switchImg(sImg,sSrc){
	oImg = document.images[sImg];
	// return true or false based on assignment
	return !(oImg.src = 'img/' + sSrc);
}

// With onkeypress event, this verifies 'Enter' key
function verifyKey(oElement,oEvent){
	if(oEvent.keyCode==13 && oElement.onclick) oElement.onclick();
}