customize picklist in crm 4.0

just open OnLoad event:

var ShipCode = crmForm.all.address1_shippingmethodcode;

ShipCode.style.display = "none";

var addDiv = document.createElement("<div style='overflow-y:auto; height:100px; border:1px#6699cc solid; background-color:#ffffff;' />");

ShipCode.parentNode.appendChild(addDiv);

for( var i = 1; i < ShipCode.options.length; i++ )

 {

    var SCOption = ShipCode.options[i];

   

    var addInputCheckBox = document.createElement("<input type='checkbox' style='border:none; width:20px; align:left;' />" );

   

    var addLabel = document.createElement( "<label />");

    addLabel.innerText = SCOption.text;

    var addBr = document.createElement( "br");

   

    ShipCode.nextSibling.appendChild(addInputCheckBox);

    ShipCode.nextSibling.appendChild(addLabel);

    ShipCode.nextSibling.appendChild(addBr);

 }