// Body Mass Index Calculator
// copyright 28th April 2006, by Stephen Chapman
// permission to use this Javascript on your web page is granted
// provided that all of the code in this script (including these
// comments) is used without any alteration
function valButton(btn) {var cnt = -1;for (var i=btn.length-1; i > -1; i--) {   if (btn[i].checked) {cnt = i; i = -1;}}if (cnt > -1) return btn[cnt].value;else return null;}function stripBlanks(fld) {var result = "";var c = 0;for (i=0; i < fld.length; i++) {if (fld.charAt(i) != " " || c > 0) {result += fld.charAt(i);if (fld.charAt(i) != " ") c = result.length;}}return result.substr(0,c);}function calc(thisform) {var d = valButton(thisform.d);if (d == null) {alert("Debe elegir cent&iacute;metros/kg or pulgadas/lb");return false;}cv = d.split(',');;var h = stripBlanks(thisform.h.value);if (h == '') {alert("Debe ingresar su altura");thisform.h.focus();return false;}if (h != Number(h) || (h = Number(h*cv[0]/100)) < 1 || h > 2.5) {alert("Altura no v&aacute;lida ingresada");thisform.h.focus();return false;}var w = stripBlanks(thisform.w.value);if (w == '') {alert("Debe ingresar su peso");thisform.w.focus();return false;}if (w != Number(w) || (w = Number(w/cv[1])) < 25 || w > 250) {alert("Peso no v&aacute;lido ingresado");thisform.w.focus();return false;} thisform.f.value = Math.round(w / (h*h)*100)/100;}