function toggle_check(control, amount)
{
	if(control.checked == true) {
		for (i = 0; i < amount; i++) {
			element = document.getElementById("check"+i);
			element.checked = true;
		}
	} else {		
		for (i = 0; i < amount; i++) {
			element = document.getElementById("check"+i);
			element.checked = false;
		}
	}
}

function select_all_list(control) {
	for(var i = 0;i < control.length;i++) {
		control.options[i].selected = true;
	}
}

function deselect_all_list(control){
	for(var i = 0;i < control.length;i++){
		control.options[i].selected = false;
	}
}

function selected_counter(control, element) {
	var counter = 0;
	for(var i = 0;i < control.length;i++) {
		if(control.options[i].selected == true) {
			counter++;
		}
	}
	document.getElementById(""+element+"").innerHTML =  counter;
}