This example dynamically changes the size of the image to 75% of its default size.
The image at its default size.

If you set the img tags width and height property to 75% this will show the image at 75% of the window size.

The following uses the image object to resize the image to 75% of its default size.

<script type="text/javascript">
function changImgSize(imgObj){
newObj= new Image()
newObj.src=imgObj.src
// if you only resize one dimension, width or height, the other will resize by the same %
// using both the following lines allows the height to be resized by a different % to the width
imgObj.style.width=newObj.width*0.75
imgObj.style.height=newObj.height*0.75
}
</script>
<img src="pic.jpg" onload="changImgSize(this)">
The following example shows how you can display your images the same size irrespective of the default image size
Image 1 Image 2 Image 3 Image 4 Image 5
The following example shows how you can change the images size irrespective of the default images size
Image 1 Image 2 Image 3 Image 4 Image 5
<img src="" name="pic1"> myImage=new Image(170,70) myImage.src="pic01.jpg" document.images["pic1"].width=myImage.width document.images["pic1"].height=myImage.height document.images["pic1"].src=myImage.src