function toggle_(id){ 
if (document.getElementById){ 
ia = id + "a";
ib = id + "b";

obj = document.getElementById(ia); 
obj1 = document.getElementById(ib); 

if (obj.style.display == "none"){ 
obj.style.display = ""; 

} else { 
obj.style.display = "none"; 
} 

if (obj1.style.display == "none"){ 
obj1.style.display = ""; 

} else { 
obj1.style.display = "none"; 
} 
} 
} 
function numonly(field) {
field.value=field.value.replace(/[^0-9]/g, '');
}