How to show image from static resource in Visualforce pages

Example
apex:image id="theImage" value="/img/myimage.gif" width="220" height="55"/>

The example above renders the following HTML:
img id="theImage" src="/img/myimage.gif" width="220" height="55">

Resource Example

The example above renders the following HTML:
img id="theImage" src="/myResourceImage" width="200" height="200">

Zip Resource Example
apex:image url="{!URLFOR($Resource.TestZip, 'images/Bluehills.jpg')}" width="50" height="50" />

The example above renders the following HTML:
id="theImage" src="[generatedId]/images/Bluehills.jpg" width="50" height="50"/>

Sample Calculator using Salesforce Site

Salesforce Site Example..

What is Salesforce

What is Salesforce?

Salesforce.com is a cloud computing and social enterprise software-as-a-service (SaaS) provider based in San Francisco. It was founded in March 1999, in part by former Oracle executive Marc Benioff.

Salesforce CRM is a SaaS product of Force.com. It is the world leading CRM tool with the most innovative features to manage your presales, sales, aftersales and marketing activities.

This was about the standard Salesforce CRM features which are easy to use most innovative and highly automated system which makes your crucial data to be managed in the most effwctive way. This data management on salesforce called practices in lead management, account management, contracts management, your sales pipeline and forcasting in the most effective tracking, customer support management. Reporting and analytics was never so easy before since salesforce started highend reporting and dynamic dashboards you can view your data in one place.

Now its open end, force.com platform which gives you freedom to develop, customise and configure your own system for any instance not just the standard CRM functionality. You can develop your own applications like warehouse management system, recruitment and payroll management, project management, surveys etc and all this too without knowing any coding ( Programming Skills). 80% customization and 20% coding makes salesforce most efficient tool for any organisation.

more about to know by clicking below links:

https://www.youtube.com/watch?v=xP1eowUbSoE

Sample Calculator using Salesforce Site

Salesforce Site Example..