function onProductDropDownChange(formPrefix){
    var productNo = document.getElementById(formPrefix + '_product').value;
    var titleNo = document.getElementById(formPrefix + '_title').value;

    var setUnitPrice = function(price){
        document.getElementById(formPrefix + '_unit_price').innerHTML = price;
    };

    switch(titleNo){
        case "ECP01":{
            switch(productNo){
                case "001":
                    setUnitPrice("4,252");
                    break;
                case "003":
                    setUnitPrice("11,481");
                    break;
            }
            break;
        }
        case "ECP02":{
            switch(productNo){
                case "001":
                    setUnitPrice("6,426");
                    break;
                case "003":
                    setUnitPrice("17,350");
                    break;
            }
            break;
        }
        case "ECP03":{
            switch(productNo){
                case "001":
                    setUnitPrice("14,742");
                    break;
                case "003":
                    setUnitPrice("39,803");
                    break;
            }
            break;
        }
        case "ECP04":{
            switch(productNo){
                case "001":
                    setUnitPrice("5,481");
                    break;
                case "003":
                    setUnitPrice("14,798");
                    break;
            }
            break;
        }
        case "ECP05":{
            switch(productNo){
                case "001":
                    setUnitPrice("6,426");
                    break;
                case "003":
                    setUnitPrice("17,350");
                    break;
            }
            break;
        }
        case "ECP06":{
            switch(productNo){
                case "001":
                    setUnitPrice("8,316");
                    break;
                case "003":
                    setUnitPrice("22,453");
                    break;
            }
            break;
        }
        case "ECP09":{
            switch(productNo){
                case "001":
                    setUnitPrice("1,890");
                    break;
                case "003":
                    setUnitPrice("5,103");
                    break;
            }
            break;
        }
        case "ECP07":{
            switch(productNo){
                case "001":
                    setUnitPrice("3,213");
                    break;
                case "003":
                    setUnitPrice("8,675");
                    break;
            }
            break;
        }
        case "ECP08":{
            switch(productNo){
                case "001":
                    setUnitPrice("8,316");
                    break;
                case "003":
                    setUnitPrice("22,453");
                    break;
            }
            break;
        }  
    }
}