var i=0;
var ImgArr = new Array();
function PrevImg()
{
if (i == 0)
{
	i = ImgArr.length -1;
}	
else
{
	i--;
}
returnObjById('ctl00_TopOffers_imgProduct').src = ImgArr[i];
}

function NextImg()
{
if (i == ImgArr.length-1)
{
	i = 0;
}	
else
{
	i++;
}
returnObjById('ctl00_TopOffers_imgProduct').src = ImgArr[i];
}

function returnObjById( id ) 
{ 
    if (document.getElementById) 
        var returnVar = document.getElementById(id); 
    else if (document.all) 
        var returnVar = document.all[id]; 
    else if (document.layers) 
        var returnVar = document.layers[id]; 
    return returnVar; 
}