如何在javascript中设置单引号

I want to set javascript variable with single quote. How it is possible. I am passing value to my function as parameter. and I am using this value to retrieve value of checkbox. So my problem is that if I am alerting value then it give me 'user' instead of 'sanjay' Here 'sanjay' is my value which is I am passing to parameter. And this will use to retrieve value of checkbox document.getElementById.I want to set javascript variable with single q