window.onscroll = getScrollXY;
function getScrollXY() {
	var scrOfX = 0, scrOfY = 0;
	if( typeof( window.pageYOffset ) == 'number' ) {
		scrOfY = window.pageYOffset; scrOfX = window.pageXOffset;
	} else if( document.body && ( document.body.scrollLeft || document.body.scrollTop ) ) {
		scrOfY = document.body.scrollTop; scrOfX = document.body.scrollLeft;
	} else if( document.documentElement && ( document.documentElement.scrollLeft || document.documentElement.scrollTop ) ) {
		scrOfY = document.documentElement.scrollTop; scrOfX = document.documentElement.scrollLeft;
	}
	//window.alert( 'Horizontal scrolling = ' + scrOfX + '\nVertical scrolling = ' + scrOfY );
	
	var anunciTop = document.getElementById("anunci");
	anunciTop.style.top = "316px";
	if(scrOfY < 250){
		posAnunci = 300 - scrOfY;
		anunciTop.style.top = posAnunci+"px";
	}else anunciTop.style.top = "50px";
}