var myStyleHref = "http://miri.cocolog-nifty.com/miri.css";
var linkElem = document.getElementsByTagName("LINK");
for(var i = 0; i < linkElem.length; i++){
	if(linkElem[i].rel == "stylesheet"){
		linkElem[i].href = myStyleHref;
		break;
	}
}