var start_y = -30;
var step = 2;
var last_y = 150;
var static_x, posi_y, timerID;
posi_y = start_y;

function Init(){
	if(document.all){
		static_x = document.body.clientWidth/2 - 105;
		subtitle.style.pixelTop = start_y;
		subtitle.style.pixelLeft = static_x;
		document.all("subtitle").style.visibility = 'visible';
	}
	if(document.layers){
		static_x = innerWidth/2 - 105;
		document.subtitle.top = start_y;
		document.subtitle.left = static_x;
		document.layers["subtitle"].visibility = 'visible';
	}
	move_image();
}

function move_image(){
	if( posi_y > last_y ){
		clearTimeout(timerID);
	}
	else{
		posi_y += step;
		if(document.all){
			subtitle.style.pixelTop = posi_y;
		}
		if(document.layers){
			document.subtitle.top = posi_y;
		}
		timerID = setTimeout("move_image()", 10);
	}
}