function autotab(object1, object2, objectsize) {
	var x = document.getElementsByTagName('input');
	for (var i=0;i<x.length;i++) {
		
		if(x[i].name==object1) {
			fld1 = x[i];
		}
		if(x[i].name==object2) {
			fld2 = x[i];
		}
	}
	if (fld1.value.length >= objectsize) {
		fld1.value = fld1.value.substr(0,objectsize)
		fld2.focus()
	}
}

/* Example use:
<input type="text" size=3 maxlength=3 name="lnpNum1" onKeyUp="autotab(lnpNum1, lnpNum2, 3);">
<input type="text" size=3 maxlength=3 name="lnpNum2" onKeyUp="autotab(lnpNum2, lnpNum3, 3);">
<input type="text" size=4 maxlength=4 name="lnpNum3">
*/