PHP Code:
function back()
{
var thestring="";
var yt="<h3>Your Text</h3>";
var text = document.forms[0].elements[0].value;
var filter = new RegExp('([\\f\\n\\r\\t\\v ])+', 'gi');
var data = text.replace(filter," ");
data = data.replace(/</gi,"").replace(/>/gi,"");
for (var i=data.length-1;i>=0;i--) {
thestring+=data.charAt(i);
}
document.getElementById("where").innerHTML=yt;
document.getElementById("where").innerHTML+=thestring;
}