Setting up page contents like images and other controls according to resolution

I have a aspx page.
I have placed images on that page by giving the image size like height=400px width=500px
When the screen resolution changes then the page is getting scrollbars which i do not want as this is the home page of website.
I want the web page to adjust the images size and other page contents according to the client's screen resolution.
Please provide any solution to this.


Regards,
Gaurav


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