JavaScript

<script language="javascript">
function ge(id){
     return document.getElementById(id);
}
function clean_n_jump(from,id){
	 ge(from).style.backgroundColor='#E9967A';
     if(id && from.value.length==2){
          ge(id).focus();
     }
}
</script>
<input type=text size=2 maxlength="2" onkeyup="clean_n_jump(this,'hgm')" id=hgt name=hgt>:<input type=text size=2 maxlength="2" onkeyup="clean_n_jump(this,'submit')" id=hgm name=hgm><input type=submit id=submit>

function clean_n_jump(from,id){
	 from.style.backgroundColor='#E9967A';