function showHide(panel){
	var positionTop = document.body.scrollTop + 20;
	
	if(document.getElementById(panel).style.display == "inline"){
		document.getElementById(panel).style.display = "none";
		document.getElementById("layer").style.display = "none";
	}else{
		document.getElementById(panel).style.display = "inline";
		document.getElementById(panel).style.top = positionTop+"px";
		document.getElementById("layer").style.display = "inline";
		document.getElementById("layer").style.height = getheight();
	}
}

function getheight(){
	var r = document.body.scrollHeight;
	return r;
}

function isNumberKey(evt){
	var charCode = (evt.which) ? evt.which : event.keyCode;
	if(charCode > 31 && (charCode < 48 || charCode > 57)){
		return false;
	}else{
		return true;
	}
}