var hp_img_ary=0;
var interval=3000;
hp_img_ary = new Array();
hp_img_pos=0;
function hp_img_init()
{
hp_img_ary[0]="banner/ban-1.jpg";
hp_img_ary[1]="banner/ban-2.jpg";
hp_img_ary[2]="banner/ban-3.jpg";
}
function hp_img_anim() 
{
	
	hp_img_init();
	divid="hp_img_div";
	imageid="hp_img_main";
	if(hp_img_pos>=hp_img_ary.length)
	{
		hp_img_pos=0;
	}
	imagefile=hp_img_ary[hp_img_pos];
	hp_img_pos++;
	millisec=1000;
    var speed = Math.round(millisec / 100);
    var timer = 0;
    //set the current image as background
    document.getElementById(divid).style.backgroundImage = "url(" + document.getElementById(imageid).src + ")";
    
    //make image transparent
    changeOpac(0, imageid);
    //make new image
    document.getElementById(imageid).src = imagefile;
    //fade in image
    for(i = 0; i <= 100; i++) 
    {
        setTimeout("changeOpac(" + i + ",'" + imageid + "')",(timer * speed));
        timer++;
    }
} 

function opacity(id, opacStart, opacEnd) 
{
    //speed for each frame
    millisec=1000;
    var speed = Math.round(millisec / 100);
    var timer = 0;

    //determine the direction for the blending, if start and end are the same nothing happens
    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++;
        }
    }
}

//change the opacity for different browsers
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 + ")";
} 

function shiftOpacity(id) 
{
    //if an element is invisible, make it visible, else make it ivisible
    if(document.getElementById(id).style.opacity == 0) {
        opacity(id, 0, 100);
    } else {
        opacity(id, 100, 0);
    }
} 
var_timer = setInterval("hp_img_anim()",interval);