function scr_add_lerpvar()
{
    ___start_value = variable_instance_get(id, argument[0]);
    ___end_value = ___start_value + argument[1];
    if (argument_count < 6)
        ___lerpvar = scr_lerpvar_instance(id, argument[0], ___start_value, ___end_value, argument[2]);
    else
        ___lerpvar = scr_lerpvar_instance(id, argument[0], ___start_value, ___end_value, argument[2], argument[3], argument[4]);
    return ___lerpvar;
}