<HTML>
<BODY>
<center>
<form>
<input type=text name=mnt value=10 size=6><br>
<input type=button value="+" onClick="javascript:this.form.mnt.value++;">
<input type=button value="−" onClick="javascript:this.form.mnt.value--;">
</form>
</center>
</BODY>
</HTML>
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