/* this is a JavaScript file that contains many functions required for ajax*/
function ajax_request() {
	if (window.XMLHttpRequest) { // Mozilla, Safari,...
		http_request = new XMLHttpRequest();
	}
	else if (window.ActiveXObject) { // IE
		try {
			http_request = new ActiveXObject("Msxml2.XMLHTTP");
		} catch (e) {
			try {
				http_request = new ActiveXObject("Microsoft.XMLHTTP");
			} catch (e) {}
			
		}
	}
	
	if (!http_request) {
		return false;
	}
	return http_request;
}

function formData2QueryString(docForm) {
	var submitContent = '';
	var formElem;
	var lastElemName = '';

	for (i = 0; i < docForm.elements.length; i++) {
		formElem = docForm.elements[i];
		switch (formElem.type) {
			// Text fields, hidden form elements
			case 'text':
			case 'hidden':
			case 'password':
			case 'textarea':
			case 'select-one':
			submitContent += formElem.name+'='+escape(formElem.value)+'&';
			break;
			
			// Radio buttons
			case 'radio':
				if (formElem.checked) {
					submitContent += formElem.name + '=' + escape(formElem.value) + '&'
				}
				break;
    
			// Checkboxes
			case 'checkbox':
				if (formElem.checked) {
					submitContent += formElem.name+'='+escape(formElem.value)+"&";
				}
				break;
		}
	}
	// Remove trailing separator
	submitContent = submitContent.substr(0, submitContent.length - 1);
	return submitContent;
}