Javascript random number
<p>I need to generate a number between 0-15 and there after add or substract that number to make:</p>

<p>Spring/ fall between -5 - 10
Summer between 10 - 25
Winter between -20 - -5</p>

<p>After that I would like to link 4 different CSS - styles that matches these numbers. For example when it's summer the numbers should be generated between 10 - 25 and be linked to a CSS with green color, when it's winter a number between -20 - -5 should be generated and linked to a CSS with blue color and so on.</p>

<p>Please help me!</p>
