Moving the caret to the end of text in an <input> element

Very simple, and the following will work in all modern browsers.

HTML

<input name="url" type="text" value="http://" />

Javascript

var inputElem = document.getElementsByName("url")[0];
                
var valLen = inputElem.value.length;

inputElem.selectionStart = valLen;
inputElem.selectionEnd = valLen;

inputElem.focus();

The same technique will work for <textarea> elements as well.