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Try:
<body onLoad="document.myForm.smsInput.focus()"> <form NAME="myForm"> <input type="text" name="count" value="160" size="3" onFocus="this.blur" readonly> <br> <textarea rows="5" cols="50" name="smsInput" wrap onKeyUp=" val = this.value; if (val.length > 160) { alert('Sorry, you are over the limit of 160 characters'); this.value = val.substring(0,160); smsInput.focus() } this.form.count.value=160-parseInt(this.value.length); "></textarea> </form> </body>