handleMenu = function(lyr){
	// menu items
	var menuItems = ['submenucb','submenucp'];

	// trigger objects
	var cbTrigger = document.getElementById('submenucbtrigger');
	var cpTrigger = document.getElementById('submenucptrigger');

	// trigger objects states
	var readAttributeCB = cbTrigger.getAttribute('class');
	var readAttributeIECB = cbTrigger.getAttribute('className');
	var readAttributeCP = cpTrigger.getAttribute('class');
	var readAttributeIECP = cpTrigger.getAttribute('className');

	if ( lyr == "submenucb" ) {
		if ( readAttributeCB == "off" || readAttributeIECB == "off" ) {
			cbTrigger.style.backgroundColor = '#C4DDF3';
			cbTrigger.setAttribute('class', 'on');
			cbTrigger.setAttribute('className', 'on');
			if ( readAttributeCP == "on" || readAttributeIECP == "on" ) {
				submenucp_.toggle();
				cpTrigger.style.backgroundColor = '#fff';
				cpTrigger.setAttribute('class', 'off');
				cpTrigger.setAttribute('className', 'off');
			}
		} else {
			cbTrigger.style.backgroundColor = '#fff';
			cbTrigger.setAttribute('class', 'off');
			cbTrigger.setAttribute('className', 'off');
		}
	} else {
		if ( readAttributeCP == "off" || readAttributeIECP == "off" ) {
			cpTrigger.style.backgroundColor = '#C4DDF3';
			cpTrigger.setAttribute('class', 'on');
			cpTrigger.setAttribute('className', 'on');
			if ( readAttributeCB == "on" || readAttributeIECB == "on" ) {
				cbTrigger.style.backgroundColor = '#fff';
				cbTrigger.setAttribute('class', 'off');
				cbTrigger.setAttribute('className', 'off');
				submenucb_.toggle();
			}
		} else {
			cpTrigger.style.backgroundColor = '#fff';
			cpTrigger.setAttribute('class', 'off');
			cpTrigger.setAttribute('className', 'off');
		}
	}

	// toggle clicked layer
	eval( lyr+"_.toggle()" );
}

handleBg = function(lyr,stat){
	var obj = document.getElementById(lyr);
	var readAttribute = obj.getAttribute('class');
	var readAttributeIE = obj.getAttribute('className');

	// alert(lyr_);

	if ( readAttribute == "off" || readAttributeIE == "off" )
	{
		if ( stat == 'on' ){
			obj.style.backgroundColor = '#C4DDF3';
		}
		else{
			obj.style.backgroundColor = '#fff';
		}
	}
}