var getBrowserHeight = function(){
	if (window.innerHeight) {
		return window.innerHeight;
	}
	else if (document.documentElement && document.documentElement.clientHeight != 0) {
		return document.documentElement.clientHeight;
	}
	else if (document.body) {
		return document.body.clientHeight;
	}
	else {
		return 0;
	}
}
var funcMoveNavi = function(){
	var scroll_value = document.body.scrollTop || document.documentElement.scrollTop;
	var browser_height = getBrowserHeight();

	if (Number(scroll_value) != NaN && Number(browser_height) != NaN && browser_height != 0){
		document.getElementById("navi").style.top = "" + (browser_height + scroll_value - 50) + "px";
		document.getElementById("navi").style.display = "block";
	}
}