function launchWindow(id) {
	
		//Get the screen height and width
		var maskHeight = $(document).height();
		var maskWidth = $(window).width();
	
		//Set heigth and width to mask to fill up the whole screen
		$('#mask').css({'width':maskWidth,'height':maskHeight});
		
		//transition effect		
		$('#mask').fadeIn(1000);	
		$('#mask').fadeTo("slow",0.8);	
	
		//Get the window height and width
		var winH = $(window).height();
		var winW = $(window).width();
              
		//Set the popup window to center
		$(id).css('top',  winH/2-$(id).height());
		$(id).css('left', winW/2-$(id).width()/2);
	
		//transition effect
		$(id).fadeIn(2000); 
}

function closeModal(){
    $('#mask').hide();  
    $('.window').hide();
}

function startContact(){
    launchWindow("div.window");
    $('#newsletter').hide();
}

function startNewsletter() {
    launchWindow("div.window");
    $('#contactus').hide();
}

function msgModal(str) {
    startNewsletter();
    $("div.modalMsg").append(str);   
}