// PopUP window centered - install note: make href tag = javascript:popUp('your_page.html','popup',200,300,'scrollbars,resizable')
function popUp(file,name,width,height,parameters,align) {
	parameters += ',width='+width+',height='+height
	parameters += ',left='+(screen.availWidth - width)/2
	parameters += ',top='+(screen.availHeight - height)/2
	popup = window.open(file,name,parameters)
	popup.window.focus()
}