Preventing the delay when src attribute of the images set via javascript
 

When you assign a source to an image via javascript, it will take sometime to load the image. To get around this problem you can preload the images creating virtual images via javascript as follows :

if(document.images)
{
// create a virtual image
var img1 = new Image();
// preload the source
img1.src = "images/masterpage/menu_1_hover.jpg";
var img2 = new Image();
img2.src = "images/masterpage/menu_1.jpg";
}