(function() {
var arrDPI = new Array();
if ( window.screen.deviceXDPI) {
arrDPI[0] = window.screen.deviceXDPI;
arrDPI[1] = window.screen.deviceYDPI;
}
else {
var tmpNode = document.createElement( "DIV" );
tmpNode.style.cssText = "width:1in;height:1in;position:absolute;left:0px;top:0px;z-index:99;visibility:hidden";
document.body.appendChild( tmpNode );
arrDPI[0] = parseInt( tmpNode.offsetWidth );
arrDPI[1] = parseInt( tmpNode.offsetHeight );
tmpNode.parentNode.removeChild( tmpNode );
}
console.dir(arrDPI);
return arrDPI;
})()