var curOS ;
if (navigator.appVersion.indexOf("Win")!=-1) curOS="Windows";
else if (navigator.appVersion.indexOf("Mac")!=-1) curOS="MacOS";
else if (navigator.appVersion.indexOf("X11")!=-1) curOS="UNIX";
else if (navigator.appVersion.indexOf("Linux")!=-1) curOS="Linux";
else curOS="unknown";

if (window.ActiveXObject) window.ie = window[window.XMLHttpRequest ? 'ie7' : 'ie6'] = true ;
else if (document.childNodes && !document.all && !navigator.taintEnabled) window.khtml = true ;
else if (document.getBoxObjectFor != null) window.gecko = true ;
if (window.ie6) try {document.execCommand("BackgroundImageCache", false, true);} catch (e){} ;

// Disable a form's submit/cancel button and submit the form. Before submitting, 
// we'll execute a callback function, if applicable...
var disableAndSubmit = function(submitID, cancelID, formID, callback){

	var oldSubmitHref, oldCancelHref ;
	if ($(submitID)) {
		if ($(submitID).getTag() == 'input') {
			$(submitID).setProperty('disabled', true) ;
		} else if ($(submitID).getTag() == 'a') {
			oldSubmitHref = $(submitID).getProperty('href') ;
			$(submitID).setProperty('href','javascript:void(0)') ;
		} 
		$(submitID).setStyle('opacity', .5) ;
	}
	if ($(cancelID)) {
		if ($(cancelID).getTag() == 'input') {
			$(cancelID).setProperty('disabled', true) ;
		} else if ($(cancelID).getTag() == 'a') {
			oldCancelHref = $(cancelID).getProperty('href') ;
			$(cancelID).setProperty('href','javascript:void(0)') ;
		} 
		$(cancelID).setStyle('opacity', .5) ;
	}

	var callback_retval = true ;
	if (typeof(callback) == 'function') {
		callback_retval = callback() ;
	}

	if (callback_retval == true) {
		return true ; 
	} else {
		if ($(submitID)) {
			if ($(submitID).getTag() == 'input') {
				$(submitID).setProperty('disabled', false) ;
			} else if ($(submitID).getTag() == 'a') {
				$(submitID).setProperty('href',oldSubmitHref) ;
			} 
			$(submitID).setStyle('opacity', 1) ;
		}
		if ($(cancelID)) {
			if ($(cancelID).getTag() == 'input') {
				$(cancelID).setProperty('disabled', false) ;
			} else if ($(cancelID).getTag() == 'a') {
				$(cancelID).setProperty('href',oldCancelHref) ;
			} 
			$(cancelID).setStyle('opacity', 1) ;
		}
		return false ;
	}
} ;

var confirmAction = function(el_name, el_action, el_url) {
	var delete_it = confirm("Do you really want to " + el_action + " item: " + el_name + "?") ;
	if (delete_it) location.href = el_url ;
} ;