function positionWindow(height,width,center) {
	if(center) {
		aw = screen.availWidth;
		ah = screen.availHeight;
		xPos = (aw/2) - width/2;
		yPos = (ah/2) - height/2;
		size = 'width=' + width + ',height=' + height + ',left=' + xPos + ',top=' + yPos;
		return size;
	}
	return 'height=' + height +',width=' + width;
}

function popUp(URL) {
	day = new Date();
	id = day.getTime();
	winsize = positionWindow(420,650,true);
	eval("page" + id + " = window.open(URL, '" + id + "', 'toolbar=1,scrollbars=1,location=1,statusbar=0,menubar=1,resizable=1," + winsize + "');");
}

var legalWindow = null;
function popUpLegal(URL) {
    windowName = 'legalWindow';
	if(!legalWindow || legalWindow.closed) {
	     winsize = positionWindow(420,720,true);
	     eval(windowName + " = window.open(URL, '" + windowName + "', 'toolbar=0,scrollbars=1,location=0,statusbar=0,menubar=0,resizable=1," + winsize + "');");
	} else {
	     window.legalWindow.location.href = URL;
	}
	window.legalWindow.focus();
}

var emailWindow = null;
function popUpEmailPage(pageURL) {
	windowName = 'emailWindow';
	URL = "/email_this_page.php?page=" + escape(pageURL);
	if(!emailWindow || emailWindow.closed) {
	     winsize = positionWindow(420,720,true);
	     eval(windowName + " = window.open(URL, '" + windowName + "', 'toolbar=0,scrollbars=auto,location=0,statusbar=0,menubar=0,resizable=1," + winsize + "');");
	} else {
	     window.emailWindow.location.href = URL;
	}
	window.emailWindow.focus();
}

var demoWindow = null;
function popUpDemo() {
	windowName = 'demoWindow';
	URL = "/demo2/vph_new_main.html";
	if(!demoWindow || demoWindow.closed) {
	     winsize = positionWindow(495,765,true);
	     eval(windowName + " = window.open(URL, '" + windowName + "', 'toolbar=0,scrollbars=0,location=0,statusbar=0,menubar=0,resizable=1," + winsize + "');");
	} else {
	     window.demoWindow.location.href = URL;
	}
	window.demoWindow.focus();
}