Change color for Priority in incident

[Mridul Srivast1]

Client Script

How to Change the Background Color for Priority in Incident :- 

function onChange(control, oldValue, newValue, isLoading, isTemplate) {
if (isLoading) {
return;
}

//Type appropriate comment here, and begin script below

if(newValue == 1) {
var element = g_form.getElement('priority');
element.style.backgroundColor = "red";
} else if(newValue == 2) {
var element1 = g_form.getElement('priority');
element1.style.backgroundColor = "orange";
} else if(newValue == 3) {
var element3 = g_form.getElement('priority');
element3.style.backgroundColor = "green";
} else {
var element4 = g_form.getElement('priority');
element4.style.backgroundColor = "black";
}

}