[EvgenijM]

var myAccount = new array();
var myAccountName;
var
if (crmForm.all.new_client_mark.DataValue != null)
{
    myName = crmForm.all.new_client_mark.DataValue;
    myAccountName = myName[0].name;
    crmForm.all.new_name.DataValue =myAccountName;
};