correctPeopleStringEnding();

function correctPeopleStringEnding()
{
    var countString = document.getElementById("peopleCount").innerHTML;
    var dependentNum = countString.substr(countString.length - 2);
    var lastCountDegit = parseInt(dependentNum.charAt(1));
    dependentNum = parseInt(dependentNum);
    if (dependentNum > 0 && dependentNum < 10 && lastCountDegit > 1 && lastCountDegit < 5)
    {
        setPeopleStringCustomEnding();
    }
    else if (dependentNum > 20 && dependentNum < 99 && lastCountDegit > 1 && lastCountDegit < 5)
    {
        setPeopleStringCustomEnding();
    }
}
function setPeopleStringCustomEnding()
{
    document.getElementById("peopleString").innerHTML = "человека";
}

function doSubmit()
{
    document.getElementById("sForm").submit();
}