calling a function

I am currently trying to call a function that will insert a style in my document but when it is called it reloads the document and makes it blank. Is there a way to keep the current text there. I read something about document.open but I am not quite sure how to use it. Here is my current code.

function style1() {
document.write('<link type="text/css" href="style1.css" REL="STYLESHEET">');
}

<a href="javascript:style1()">SOME</a>