function resize() {

	mappa = document.getElementById('map_canvas');
	mappa.style.height = Screen.getDocumentHeight();
	
	$('#content').css('height', Screen.getDocumentHeight() - 48+'px');
	
}

$(document).ready(function(){
	
	$(".btn_menu").mouseover(function() {
		$(this).attr("src",$(this).attr("src").replace("off.jpg","on.png"));							   
	}).mouseout(function() {
		$(this).attr("src",$(this).attr("src").replace("on.png","off.jpg"));	
	});
	
	$(".btn_alpha").mouseover(function() {
		$(this).fadeTo('fast', 0.6);
	}).mouseout(function() {
		$(this).fadeTo('fast', 1);
	});
	
	$('#content').css('height', Screen.getDocumentHeight() - 48+'px');
	
});