var currentTime = new Date()
var month = currentTime.getMonth() + 1
var day = currentTime.getDate()

if(month == 3 && day == 3){
    // if day is 3 Mart

    var div = document.getElementById('headermain');

    div.style.background = 'url(images/vestiThirdMart.jpg)';
    div.style.backgroundPosition = '170px 0';
    div.style.backgroundColor = '#003d88';
    div.style.backgroundRepeat = 'no-repeat';
}