var num= document.getElementsByName("image_width")[0].value;
document.getElementsByName("image_height")[0].value = num-(num-1);
document.getElementsByName("image_width")[0].value= num*100;

To put images into the description, it's formatted with [img]Direct image link here[/img].

To make images clickable, it's done with [url等于xxx][img]image link[/img][/url]

tolove吧