var crossFadeSuresi = 600;
var alanlar = new Array();alanlar[0] = 'alan-1';alanlar[1] = 'alan-2';alanlar[2] = 'alan-3';alanlar[3] = 'alan-4';alanlar[4] = 'alan-5';var p = alanlar.length;
function goster(id)
{
	gizle(id);
	setTimeout("degistir("+ id +")", crossFadeSuresi);
}

function gizle(id)
{
	setTimeout("changeOpac(0,'vitrin')", crossFadeSuresi);
	opacity('vitrin', 100, 0, crossFadeSuresi);	
}

function degistir(gid)
{
	for ( i = 0; i < p; i++ )
		document.getElementById(alanlar[i]).style.display = 'none';
		
	document.getElementById(alanlar[ gid ]).style.display = 'block';
	setTimeout("bitir("+ gid +")", crossFadeSuresi);
}

function bitir(id)
{
	setTimeout("changeOpac(100,'vitrin')", crossFadeSuresi);
	opacity('vitrin', 0, 100, crossFadeSuresi);	
}

function opacity(id, opacStart, opacEnd, millisec) {
    var speed = Math.round(millisec / 100);
    var timer = 0;

    if(opacStart > opacEnd) {
        for(i = opacStart; i >= opacEnd; i--) {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    } else if(opacStart < opacEnd) {
        for(i = opacStart; i <= opacEnd; i++)
            {
            setTimeout("changeOpac(" + i + ",'" + id + "')",(timer * speed));
            timer++;
        }
    }
}

function changeOpac(opacity, id) {
    var object = document.getElementById(id).style;
    object.opacity = (opacity / 100);
    object.MozOpacity = (opacity / 100);
    object.KhtmlOpacity = (opacity / 100);
    object.filter = "alpha(opacity=" + opacity + ")";
}