Get screen resolution and set style from javascript

function setLogoOnLowScreenRes()
{
if ((window.screen.width<=800))
{
//you can apply styling for screen resolution 800
document.getElementById("wrapper").style.marginLeft = "58px";
}
else if((window.screen.width<=1024))
{
//you can apply styling for screen resolution 1024
document.getElementById("wrapper").style.marginLeft = "69px";
}
}