If you don't mind using jQuery, here is a simple code snippet to help you out. (Otherwise comment and I'll write a pure-js example
function loadStyleSheet(src) {
if (document.createStyleSheet){
document.createStyleSheet(src);
}
else {
$("head").append($("<link rel='stylesheet' href='"+src+" />"));
}
};
Just call this in your $(document).ready() or window.onload function and you're good to go.
For #2, why don't you try it out? Disable Javascript in your browser and see!
By the way, it's amazing how far a simple google search can get you; for the query "post load css", this was the fourth hit...
http://www.vidalquevedo.com/how-to-load-css-stylesheets-dynamically-with-jquery
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