You can use
JavaScript for setting the zoom level
Try this:
function SetResolution()
{
if(screen.width=1280)
{
var wdth = 1024;
document.body.style.zoom = screen.width/1024;
}
}
You can put this code inside the body of .aspx and can call it like this:
<body onload="SetResolution()">
hope it helps :)