[рони]

anar1811,

var element = document.querySelectorAll('.main-child > td:first-child');
var elem = document.getElementsByClassName('main-child');
function search() {
    for (var i = 0; i < element.length; i++) {
            elem[i].style.backgroundColor = '';
        if (src.value == element[i].innerHTML) {
            elem[i].style.backgroundColor = '#666';
        }
    }

}