function formatCurrency(num)
{
num = num.toString().replace(/\$|\,/g,'');
if(isNaN(num))
num = "0";
sign = (num == (num = Math.abs(num)));
num = Math.floor(num*100+0.50000000001);
cents = num%100;
num = Math.floor(num/100).toString();
if(cents<10)
cents = "0" + cents;
for (var i = 0; i < Math.floor((num.length-(1+i))/3); i++)
num = num.substring(0,num.length-(4*i+3))+','+
num.substring(num.length-(4*i+3));
return (((sign)?'':'-') + '$' + num + '.' + cents);
}
//
function change(which, to)
{
document.getElementById(which).disabled = to;
}
//
function get_value(of)
{
return document.getElementById(of).value;
}
//
function untick(what)
{
return document.getElementById(what).checked = false;
}
//
function is_ticked(what)
{
return document.getElementById(what).checked;
}
//
function reset_dd(which)
{
document.getElementById(which).selectedIndex = 0;
}
//
function disable_all()
{
change('uv_protection', true);
change('tints', true);
change('thin_lenses', true);
change('anti_reflective', true);
change('photochromic', true);
change('polarised', true);
}
//
function enable_all(val)
{
change('uv_protection', false);
change('tints', false);
change('thin_lenses', false);
change('anti_reflective', false);
change('photochromic', false);
change('polarised', false);
if(val == '')
{
disable_all();
}
}
//
function value(of, v)
{
document.getElementById(of).value = v;
}
//
function cell(which,value)
{
document.getElementById(which).innerHTML = value;
}