function common(name)
{
    this.name = name;
    this.object = document.getelementbyid();
    this.setfontsize = function(size)
    {
        document.getelementbyid(this.object).style.fontsize = size;
    }
}

function size(s)
{
    var uc = new common("uc");
    uc.object = "contentid";
    uc.setfontsize(s)
}