function js_initcalendar(plugin,field,date,time){
	if(document.getElementById(plugin+"["+field+"]")){
		//calendar
		Calendar.setup({
			inputField     :    plugin+"["+field+"]",
			ifFormat       :    "%d.%m.%Y",
			date           :    date,
			showsTime      :    time,
			singleClick    :    true
		});
	}
}