Which of the following code snippets changes an image on the page?

Which will check whether the variable vRast exists or not?

An image tag is defined as follows: The purpose of the ImageChange() function is to change the image source to Image2.jpg. Which of the following should the ImageChange() function look like?

How can created cookies be deleted using JavaScript?

Analyze the following code snippet which uses a Javascript Regular Expression character set. What will be the output of this code?

Which can be used for adding direct support for XML to JavaScript?

screen.pixelDepth is not available in Internet Explorer 7.

What's the output? function a() {alert(x);} function b() {var x = 'function b'; a();} b();

What's the output? ( function(name){ alert(name + ' programming language'); } )(' JavaScript ');

Value of c in the following code? function a() {} a.prototype.version = '1.8'; var b = new a(); var c = b.prototype.version;

In the W3C model, which method can you use to prevent default behavior of an event?