function calWeekdayRow(){
    var dayName = ["SUN", "MON", "TUES", "WED", "THU", "FRI", "SAT"];
    var rowHTML = "<tr>";
    for(var i=0; i<dayName.length; i++){
        rowHTML += "<th class='calendar_weekdays'>"+dayName[i]+"</th>";
    }
    rowHTML+="</tr>";
    return rowHTML;
}