IStat Pro widget shows gradual increase in RAM usage

I have the iStat Pro widget on my dashboard. every time i open up the dashboard, it shows that i have less and less RAM free, which obviously worries me, since whenever I open up dashboard i am idle; im not doing anything besides reading a webpage, or just charging my iPod. I would understand if there is less RAM while i am working with my pictures, but it does worry me. Please help, anyone that can, I greatly appreciate the help :-)!

Any running process on the Mac may consume more RAM over time. Safari and other browsers especially will use more RAM over time. However, free RAM is misleading as an indicator of whether you're running out of memory. Available RAM is the sum of Free RAM and Inactive RAM. Although you may notice that Free RAM may decrease over time, you still have plenty of available RAM when you include Inactive RAM. See the following:
About OS X Memory Management and Usage
Reading system memory usage in Activity Monitor
Memory Management in Mac OS X
Performance Guidelines- Memory Management in Mac OS X
A detailed look at memory usage in OS X
Understanding top output in the Terminal
The amount of available RAM for applications is the sum of Free RAM and Inactive RAM. This will change as applications are opened and closed or change from active to inactive status. The Swap figure represents an estimate of the total amount of swap space required for VM if used, but does not necessarily indicate the actual size of the existing swap file. If you are really in need of more RAM that would be indicated by how frequently the system uses VM. If you open the Terminal and run the top command at the prompt you will find information reported on Pageins () and Pageouts (). Pageouts () is the important figure. If the value in the parentheses is 0 (zero) then OS X is not making instantaneous use of VM which means you have adequate physical RAM for the system with the applications you have loaded. If the figure in parentheses is running positive and your hard drive is constantly being used (thrashing) then you need more physical RAM.

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