function ChgClass(object,dclass)
{
	object.className = dclass;
}

function openwindow(url,target,props)
{
	var a = window.open(url,target,props);
}

function Enlarge()
{
	openwindow("fotografia.php?image="+document.getElementById("imagen_id").value,"_fotografia","width=400,height=299,scrollbars=no");
}

function Preview(image)
{
	document.getElementById("imagen_id").value = image;
	document.getElementById("imagen").src= "images/thumbs.php?id=" + image + "&w=226&h=169";
}

function CheckTextarea(textarea_id,chars)
{
		obj = document.getElementById(textarea_id);
		//alert(obj.value);

		if(obj.value.length >= chars)
		{
			obj.value = obj.value.substring(0,chars);
		}
		//document.getElementById("sizebox").value = obj.value.length;
		return true;
}