[рони]

bakmaks,
странная конструкция ...

var newImg = document.createElement('newImg')25 newImg = Images[i];

....
может так попробовать

function getImages()
	{
		var I = [];
		for ( var i = 0; i < 10; i++ )
		{
			var myImage = new Image();
			myImage.src = "../img/pict" + (i+1) + ".jpg";
		   	I.push(myImage);
		}
		return I;
	}
	function onPhotoClick()
	{
		var photo = document.getElementById("photo");
		photo.src = this.src;
	}
	window.onload = function()
	{
		var phContainer = document.getElementById('photoContainer');
		var Images  = getImages();
		for (var i =0; i < 10; i++)
		{
			var newImg = new image()
            newImg.src = Images[i].src;
			newImg.width = Images[i].width / 5;
			newImg.height = Images[i].height / 5;
			phContainer.appendChild(newImg);
			newImg.onclick = onPhotoClick;
		}
	}