Код:

function appendCSSRule(selector, style)
{
if (document.styleSheets)
{
if (document.styleSheets[0].insertRule) document.styleSheets[0].insertRule(selector+” { “+style+” }”, document.styleSheets[0].cssRules.length);
else if(document.styleSheets[0].addRule) document.styleSheets[0].addRule(selector, style, document.styleSheets[0].rules.length);
}
}

function insertCSSRule(selector, style, i)
{
if (document.styleSheets)
{
if (document.styleSheets[0].insertRule) document.styleSheets[0].insertRule(selector+” { “+style+” }”, i);
else if(document.styleSheets[0].addRule) document.styleSheets[0].addRule(selector, style, i);
}
}

appendCSSRule(”#box1″,”border: 2px solid red”);