Well I am going to continue with my opinion about webquest,
 Let me tell you that I found a good video about webquest, please mates if you want to  know more about this, you can check it.
For me is a good video because in this video I understood what is the principal function of a webquest also I found some information about how to create a webquest:

Creating WebQuests

Technologically, creating a WebQuest can be very simple. As long as you can create a document with hyperlinks, you can create a WebQuest. That means that a WebQuest can be created in Word, Powerpoint, and even Excel! If you're going to call it a WebQuest, though, be sure that it has all the critical attributes.
A real WebQuest....

• is wrapped around a doable and interesting task that is ideally a scaled down version of things that adults do as citizens or workers.

• requires higher level thinking, not simply summarizing. This includes synthesis, analysis, problem-solving, creativity and judgment.

• makes good use of the web. A WebQuest that isn't based on real resources from the web is probably just a traditional lesson in disguise. (Of course, books and other media can be used within a WebQuest, but if the web isn't at the heart of the lesson, it's not a WebQuest.)

• isn't a research report or a step-by-step science or math procedure. Having learners simply distilling web sites and making a presentation about them isn't enough.

• isn't just a series of web-based experiences. Having learners go look at this page, then go play this game, then go here and turn your name into hieroglyphs doesn't require higher level thinking skills and so, by definition, isn't a WebQuest.

 if you want to know more information about webquest you can check this video http://www.youtube.com/watch?v=v7UynehA_l0