Hi.
I want to set the background color for mandatory lookup fields just like below image.

it's perfectly working in crm 2011 rollup 8 for below code
document.getElementById(lookupfilename+ "_d").childNodes[0].childNodes[0].childNodes[0].childNodes[0].childNodes[0].style.backgroundColor = color;
but not work in crm 2011 rollup 16.if I click the lookup means the color will disappear.
what's the code for crm 2011 rollup 16 for set the background color to lookup field,anybody know share with me.
Regards,
Srimathy