document.getElementByClassName("preview").innerHTML=src;
function update(previewPic){
/* In this function I should
1) change the URL for the background image of the div with the id = "image"
to the source file of the preview image
2) Change the text of the div with the id = "image"
to the alt text of the preview image
*/
document.getElementById("image").setAttribute('style', 'background-image: url(' + previewPic.getAttribute("src") + ')');
document.getElementById("image").innerHTML = previewPic.getAttribute("alt");
}
function undo(){
document.getElementById("image").style.backgroundImage = "";
document.getElementById("image").title = "";
}