js改变textbox背景颜色方法之一

function Check1()
{   var check1 = document.getElementById("year"); 
    var check2 = document.getElementById("date"); 
    var txtYear = document.getElementById("txtYear"); 
    var txtbegin = document.getElementById("txtbegin"); 
    var txtEnd = document.getElementById("txtEnd"); 
    if (check1.checked == true) { 
        txtYear.disabled = false; 
        txtYear.style.backgroundColor = "white"; 
        check2.checked =false; 
        txtbegin.disabled = true; 
        txtbegin.style.backgroundColor ="E0E0E0"; 
        txtEnd.disabled = true; 
        txtEnd.style.backgroundColor = "E0E0E0"; 
    }
}