H! Hover Selector

H! Hover Selector
1. use row_hover.call(this);
2. use "row_hover" in window rather than typeof window["row_hover"]
3. this.runtimeStyle.behavior="none" for one-time css expression

tr {
    behavior: expression(
    /*you can remove these following comments, make it clearner*/
    ("row_hover" in window)
    /*detect wherther window.row_hover is declared*/
    ? window.row_hover.call(this)
    /*call window.row_hover from */
    : window.row_hover =
    /*declare window.row_hover if it`s not declared*/
    /*pretty cool, let`s put JS function here, huh!*/
    function() {;
        this.runtimeStyle.behavior = "none";
        /*OK, remove `s behavior since it had finish his job*/
        this.onmouseover = function() {
            this.className = "hover";
        };
        /*go on~*/
        this.onmouseout = function() {
            this.className = "";
        };
        /*go on~*/
    });
    /*OK, that`s it~*/
}

/*Let`s make it compatible for most modern browsers*/
tr.hover, tr:hover{background:#336699;color:white;}