jsp code

Im tyrying use following code to browse an image and preview it before uploading.Its not working for jpeg image.Can anybody suggest changes or new code for it

maxWidth) { y*=maxWidth/x; x=maxWidth; } if (y>maxHeight) { x*=maxHeight/y; y=maxHeight; } field.style.display=(x<1 || y<1)?"none":""; field.src=globalPic.src; field.width=x; alert("3."+field.width); field.height=y; alert("4."+field.height); } // End -->

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