// Javascript from Moodle modules
wrs_addEvent(window, 'load', function () {
	wrs_imageAlignFix();
});

/* Image align bug: "align" attribute is not standard, so there are browsers that does not support it. */

function wrs_imageAlignFix() {
	var images = document.getElementsByTagName('img');
	
	for (var i = images.length - 1; i >= 0; --i) {
		if (images[i].className == 'Wirisformula') {
			images[i].style.verticalAlign = (-images[i].height / 2) + 'px';
		}
	}
}

/* Tools */

/**
 * Cross-browser addEventListener/attachEvent function.
 * @param object element Element target
 * @param event event Event
 * @param function func Function to run
 */
function wrs_addEvent(element, event, func) {
	if (element.addEventListener) {
		element.addEventListener(event, func, false);
	}
	else if (element.attachEvent) {
		element.attachEvent('on' + event, func);
	}
}
/**
 * JavaScript for checking or unchecking 
 * all the students or all students in a group.
 *
 * @param toggle Check All/None
 * @param start the first checkbox to be changed
 * @param end the last checkbox to be changed
 * return boolean
 **/
function block_quickmail_toggle(toggle, start, end) {
    // Element ID
    var id = 'mailto'+start;

    // iterate through all of the appropriate checkboxes and change their state
    while(document.getElementById(id) && start != end) {
        document.getElementById(id).checked = toggle;
        start++;
        id = 'mailto'+start;
    }

    return false;
}