function fieldCheck(field) {
	var element = '#' + field;
	var content = $(element).val();
	switch (field) {
		case 'username':
			var postData = 'content=' + content;
			$.ajax({
				type: 'POST',
				url: '/scripts/usernamecheck.php',
				data: postData,
				success: function(msg) {
					if (msg == 'valid') {
						$(element).css({
							background: "url('/images/icons/success.png') no-repeat",
							backgroundPosition: "285px 50%"
						});
					} else {
						$(element).css({
							background: "url('/images/icons/error.png') no-repeat",
							backgroundPosition: "285px 50%"
						});
					}
				}
			});
			
			break;
		
		case 'email':
			var postData = 'content=' + content;
			$.ajax({
				type: 'POST',
				url: '/scripts/emailcheck.php',
				data: postData,
				success: function(msg) {
					if (msg == 'valid') {
						$(element).css({
							background: "url('/images/icons/success.png') no-repeat",
							backgroundPosition: "285px 50%"
						});
					} else {
						$(element).css({
							background: "url('/images/icons/error.png') no-repeat",
							backgroundPosition: "285px 50%"
						});
					}
				}
			});
							
			break;
		
		case 'password':
			if (content.length < 6) {
				$(element).css({
					background: "url('/images/icons/error.png') no-repeat",
					backgroundPosition: "285px 50%"
				});
			} else {
				$(element).css({
					background: "url('/images/icons/success.png') no-repeat",
					backgroundPosition: "285px 50%"
				});
			}
			break;
	}
}