//usage
$("input").keyup(function() {
   toUpper(this);
});


//function
function toUpper(obj) {
var mystring = obj.value;
var sp = mystring.split(' ');
var wl=0;
var f ,r;
var word = new Array();
for (i = 0 ; i < sp.length ; i ++ ) {
f = sp[i].substring(0,1).toUpperCase();
r = sp[i].substring(1).toLowerCase();
word[i] = f+r;
}
newstring = word.join(' ');
obj.value = newstring;
return true;   
}

Prevents users from entering all caps for titles, text.

Capitalize First Letter of Every Word on Keypress

jQuery