function js_getDPI() {
 var arrDPI = new Array();
 if (window.screen.deviceXDPI != undefined) {
? 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); 
 }
 return arrDPI;
}