totalImgs=12;
function loadPresentationImages(){
	for (var i=1;i<(totalImgs+1);i++){
		var img=new Image();
			img.src='images/presentation/' + i + '.jpg';
	}
}
loadPresentationImages();
function changePresentationImage(nrImg){
	if(nrImg > totalImgs){
		nrImg=1;	
	}
	var imgSlide=document.getElementById('imgSlide');
	imgSlide.src='images/presentation/'+nrImg+'.jpg';
	var t=setTimeout('changePresentationImage('+(nrImg+1)+');',5000);
}
function startSlie(){
	changePresentationImage(1);
}