var flashOffsetLeft = 0;
var sailingObjContainer;
var objTopMargin = 0;
var startTop = 0;
var posTo;

var headHeight;

$(document).ready(function(){
	headHeight = $('#sailingBlockContainer').offset().top;
	
	floatBlockInit();
	moveSailingBlock();
});


$(window).scroll(moveSailingBlock);

$(window).resize(moveSailingBlock);


function floatBlockInit() {	
	$("#sailingContainer").css({'left' : flashOffsetLeft, 'display' : 'block', 'visibility' : 'visible'});
}



function moveSailingBlock() {
	var dif = 0;
			
	menuHeight = $("#sailingContainer").height();
	menuWidth = (document.getElementById('gPageMenu1') || document.getElementById('gPageMenu2') || document.getElementById('gPageMenu3')).offsetWidth;
	
	if(document.getElementById('sailingBlockContainer').offsetHeight < menuHeight /*+ botLimit*/)
		return;
	
	documentObjTop = window.document.body.scrollTop;		
	
	documentObjTop = (documentObjTop < headHeight) ?  0 : window.document.body.scrollTop - headHeight;
	startTop = parseFloat(document.getElementById('sailingContainer').style.top);			
	
	// if menu is higher than screen
	if(screenSize().h < menuHeight) {
		
		// move down
		if(documentObjTop > startTop) {
			if(documentObjTop < (startTop + (dif = menuHeight - screenSize().h))) {
				return;
			} else {
				posTo = documentObjTop + objTopMargin - dif;	
			}
		}
		// move up
		else {
			if(documentObjTop > startTop) {
				return;
			} else {
				posTo = documentObjTop + objTopMargin;	
			}
		}	
	} else {
		posTo = documentObjTop + objTopMargin;	
	}	
	
	if(posTo > document.getElementById('sailingBlockContainer').offsetHeight /*- botLimit*/ - menuHeight)
		posTo = document.getElementById('sailingBlockContainer').offsetHeight /*- botLimit*/ - menuHeight;
	
		$('#sailingContainer').stop().animate({top:posTo},{duration:1000,queue:false});

}

function screenSize() {
    var w, h; // Объявляем переменные, w - длина, h - высота
    w = (window.innerWidth ? window.innerWidth : (document.documentElement.clientWidth ? document.documentElement.clientWidth : document.body.offsetWidth));
    h = (window.innerHeight ? window.innerHeight : (document.documentElement.clientHeight ? document.documentElement.clientHeight : document.body.offsetHeight));
    
    return {w:w, h:h};
}