var gb_element;

function gb_show() {
    gb_element = document.getElementById("gb_box");
    if(gb_element.style.display == "none") {
        gb_element.style.display = "block"; 
    } else {
        gb_element.style.display = "none";
    }
}

function gb_slide() {
	//document.getElementById("gb_box").style.left = ((screen.width /2) - 200) + "px";
	gb_element.style.display = "block";
	slide();
}

function slide(direction) {
	if(direction == "out"){
		if(gb_element.style.left >= (((screen.width / 2) + 146) + "px")) {
			gb_element.style.left = ((screen.width / 2) + 146) + "px";
			return;
		}
		gb_element.style.left = parseInt(gb_element.style.left) - 5 + "px";
		setTimeout("slide('out')",30);
	} else {
		if(gb_element.style.left >= ((screen.width / 2) + 146) + 170 + "px") {
			return;
		}
		gb_element.style.left = parseInt(gb_element.style.left) + 5 + "px";
		setTimeout("slide()",30);
	}
}

function input_clear() {
	if(document.getElementById("uname").value == "Name") {
		document.getElementById("uname").value = "";
	}
}

function textarea_clear() {
	if(document.getElementById("umessage").value == "Ihre Nachricht") {
		document.getElementById("umessage").value = "";
	}
}