// Get the first stylesheet
var ss = document.styleSheets[0]
// Use insertRule() for standards, addRule() for IE
if ("insertRule" in ss) {
ss.insertRule('div.txtArea::-moz-selection { background: transparent; }', 0);
ss.insertRule('div.txtArea::selection { background: transparent; }', 0);
ss.insertRule('div.txtArea::-webkit-selection { background: transparent; }', 0);
}