//FLASH FUNCTIONS
function increase_page() {
	document.getElementById('current_page').value++;
}

function decrease_page() {
	document.getElementById('current_page').value--;
}

function set_page(page_num) {
	document.getElementById('current_page').value=page_num;
}


//HIDE NEXT BUTTON
function hide_next_btn() {	
	document.getElementById('next_btn').style.display = 'none';
	document.getElementById('false_next_btn').style.display = 'inline';
}


//CHECK INPUT LENGTH
function check_length(field, display, warning, max) { 
    var str_length = field.value.length;
    var max_length = max;

    if (str_length > max_length) { 
        document.getElementById(display).innerHTML = '';
		document.getElementById(warning).innerHTML = str_length;
    }
	else { 
		document.getElementById(display).innerHTML = str_length;
		document.getElementById(warning).innerHTML = '';
    }
}


//TOGGLE
function toggle(id) {
	var the_target = document.getElementById(id);
  
	if (the_target.style.display == 'none') {
		the_target.style.display = 'block';
  	}
	else {
		the_target.style.display = 'none';
 	}
}


//ADD EMAIL FIELD
function add_field() {
	target_id = 'email_' + field_count;
	
    if (field_count <= 20) { 
		document.getElementById(target_id).style.display = 'block';
    }

	if (field_count >= 20) {
		document.getElementById('plus_btn').style.display = 'none';
	}
	
	field_count++;
}