Set lookup value in Newform.aspx for 20+ items

Setting lookup value in newform.aspx for 20+ itmes

//field Title is title of the column , lookupVal is ID of the look up options.

function setLookup( fieldTitle, lookupVal)
{
    //Set default value for lookups with less that 20 items
    if ( $("select[title='" +fieldTitle+ "']").html() !== null)
    {
       $("select[title='"+ fieldTitle +"']").val(lookupVal);   
    }
    else
    {
        //get the hiddent input using the "optHid" attribute of displayed Input
        hiddenInput = $("input[title='" +fieldTitle +"']").attr("optHid");
        //set value in the hidden input
        $("input[id='" +hiddenInput +"']").attr("value",lookupVal)

        //get the string of choices from the input element so we can set displayed value
        choices = $("input[title='" +fieldTitle +"']").attr("choices");
       
        //turn choices string into an array so we can iterate through it
        choiceArray = choices.split("|");
       
        //improve performance by iterating over every other entry (just look at values)
        for (index = 1; index < choiceArray.length; index = index + 2)
        {
            if (choiceArray[index] == lookupVal){
                //set the displayed input which is the PREVIOUS entry in array
                $("input[title='" +fieldTitle +"']").val(choiceArray[index - 1]);   
            }
        }
    }
}