function setFooterFix(){
	var id = document.getElementById('footer_fix');

	if( window.innerHeight ){
		height = window.innerHeight-45;
	}else{
		height = document.documentElement. clientHeight-35;
	}

	defaultHeight = document.body.clientHeight;

	if(height>defaultHeight)
		id.style.bottom = "0px";
	else
		id.style.bottom = null;
}