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Using the createElement function provided in this answer, which is necessary due to IE's brokenness with the name attribute on elements created normally with document.createElement:

function postToURL(url, values) {
 values = values || {};
 var form = createElement("form", {action: url,
 method: "POST",
 style: "display: none"});
 for (var property in values) {
 if (values.hasOwnProperty(property)) {
 var value = values[property];
 if (value instanceof Array) {
 for (var i = 0, l = value.length; i < l; i++) {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value[i]}));
 }
 }
 else {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value}));
 }
 }
 }
 document.body.appendChild(form);
 form.submit();
 document.body.removeChild(form);
}

Using the createElement function provided in this answer, which is necessary due to IE's brokenness with the name attribute on elements created normally with document.createElement:

function postToURL(url, values) {
 values = values || {};
 var form = createElement("form", {action: url,
 method: "POST",
 style: "display: none"});
 for (var property in values) {
 if (values.hasOwnProperty(property)) {
 var value = values[property];
 if (value instanceof Array) {
 for (var i = 0, l = value.length; i < l; i++) {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value[i]}));
 }
 }
 else {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value}));
 }
 }
 }
 document.body.appendChild(form);
 form.submit();
 document.body.removeChild(form);
}

function postToURL(url, values){
 values = values || {};
 var form = createElement("form", {action: url,
 method: "POST",
 style: "display: none"});
 for (var property in values) {
 if (values.hasOwnProperty(property)) {
 var value = values[property];
 if (value instanceof Array) {
 for (var i = 0, l = value.length; i < l; i++) {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value[i]}));
 }
 }
 else {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value}));
 }
 }
 }
 document.body.appendChild(form);
 form.submit();
 document.body.removeChild(form);
}

function postToURL(url, values){
 values = values || {};
 var form = createElement("form", {action: url,
 method: "POST",
 style: "display: none"});
 for (var property in values) {
 if (values.hasOwnProperty(property)) {
 var value = values[property];
 if (value instanceof Array) {
 for (var i = 0, l = value.length; i < l; i++) {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value[i]}));
 }
 }
 else {
 form.appendChild(createElement("input", {type: "hidden",
 name: property,
 value: value}));
 }
 }
 }
 document.body.appendChild(form);
 form.submit();
 document.body.removeChild(form);
}

Using the createElement function provided in this answer, which is necessary due to IE's broken document.createElement:

Using the createElement function provided in this answer, which is necessary due to IE's brokenness with the name attribute on elements created normally with document.createElement: