var imgsrc = new Array();
imgsrc[0] = "images/view01.jpg";
imgsrc[1] = "images/view02.jpg";
imgsrc[2] = "images/view03.jpg";
imgsrc[3] = "images/view04.jpg";

tmp=0;

function trig()
{
setInterval("ld(++tmp)",30000);
}

function ld(imgid)
{
document.getElementById("dimg").src=imgsrc[imgid];
if(tmp==imgsrc.length-1)
{
tmp=-1;
}
}