var current = 0;
var myPics = new Array();
var myTimer = setInterval('checkIt(1)',10000); // 10 second interval;

function addPic(_p) {
  myPics[myPics.length?myPics.length:0] = new Image();
  myPics[myPics.length-1].src=_p; // preload all pics
}

addPic("http://www.charmcityswing.com/images/dancers/dancers5.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers6.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers11.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers13.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers2.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers4.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers12.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers9.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers7.jpg");
addPic("http://www.charmcityswing.com/images/dancers/dancers10.jpg");

function checkIt(val) {
  current = Math.abs((current+parseInt(val))%myPics.length);
  document.myimg.src = myPics[current].src;
}