<textarea id="idText">
Hello Apple!
Hello Android!
</textarea>

<script language="javascript" type="text/javascript">
var Mobile="";
var sUsrAgt=navigator.userAgent;

if((/iPhone/i.test(sUsrAgt)) || (/iPod/i.test(sUsrAgt))) Mobile="IP";
else if((/series60/i.test(sUsrAgt)) || (/symbian/i.test(sUsrAgt))) Mobile="SY";
else if(/iPad/i.test(sUsrAgt)) Mobile="IA";
else if(/android/i.test(sUsrAgt)) Mobile="AN";
else if(/windows ce/i.test(sUsrAgt)) Mobile="WM";
else if(/blackberry/i.test(sUsrAgt)) Mobile="BB";
else if(/palm/i.test(sUsrAgt)) Mobile="PM";
else if(/Kindle/i.test(sUsrAgt)) Mobile="KD";

var oTextArea=document.getElementById("idText");

function selectMobile() {
oTextArea.setSelectionRange(0, 9999);
}

function selectAll()
{
if (Mobile) {
oTextArea.focus();
setTimeout("selectMobile()",1234);
}
else {
oTextArea.select();
}
}

selectAll();

</script>