/*
 *	Fichero para la previsualizacion de las imagenes en una capa aparte.
 *
*/
var ie = document.all;
var ns6 = (document.getElementById && !document.all);

function ietruebody(){
	return (document.compatMode && document.compatMode!="BackCompat" && !window.opera) ? document.documentElement : document.body;
}

function enlarge(imagen, e, posicion, texto, textoCerrar,imgwidth, imgheight){
	
	if (ie||ns6){
		crossobj = document.getElementById ? document.getElementById("PopUpverImagen") : document.all.PopUpverImagen;
		if (posicion=="center"){
			pgyoffset = ns6 ? parseInt(pageYOffset) : parseInt(ietruebody().scrollTop);
			horzpos = ns6 ? pageXOffset + (window.innerWidth/2) - (imgwidth/2) : ietruebody().scrollLeft + (ietruebody().clientWidth/2) - (imgwidth/2);
			vertpos = ns6 ? pgyoffset + (window.innerHeight/2) - (imgheight/2) : pgyoffset+ietruebody().clientHeight/2-imgheight/2
			if (window.opera && window.innerHeight) //compensate for Opera toolbar
				vertpos=pgyoffset+window.innerHeight/2-imgheight/2
			vertpos=Math.max(pgyoffset, vertpos)
		}
		else{
			var horzpos=ns6 ? pageXOffset+e.clientX : ietruebody().scrollLeft+event.clientX
			var vertpos=ns6 ? pageYOffset+e.clientY : ietruebody().scrollTop+event.clientY
		}
		crossobj.style.left = horzpos + "px"
		crossobj.style.top = vertpos + "px"
		crossobj.innerHTML='<div align="right" id="PopUpBarraArrastre"><span id="textoCerrar" onClick="closepreview()">'+textoCerrar+'</span> </div><img src="'+imagen+'"><br><div align="center" nowrap>' + texto + '</div>'
		
		showOverlay(crossobj)
		crossobj.style.zIndex = 501
		
		crossobj.style.visibility="visible"
		return false;
	}
else //if NOT IE 4+ or NS 6+, simply display image in full browser window
	return true
}

function closepreview(){
	hideOverlay(crossobj)
	crossobj.style.visibility="hidden"
}

function drag_drop(e){
	if (ie&&dragapproved){
		crossobj.style.left=tempx+event.clientX-offsetx+"px"
		crossobj.style.top=tempy+event.clientY-offsety+"px"
	}
	else if (ns6&&dragapproved){
		crossobj.style.left=tempx+e.clientX-offsetx+"px"
		crossobj.style.top=tempy+e.clientY-offsety+"px"
	}
	var overID = crossobj.ID + "_over";
	var overs = document.getElementById(overID);
	overs.style.top = crossobj.style.top;
	overs.style.left = crossobj.style.left;
	return false
}

function initializedrag(e){
	if (ie&&event.srcElement.id=="PopUpBarraArrastre"||ns6&&e.target.id=="PopUpBarraArrastre"){
		offsetx=ie? event.clientX : e.clientX
		offsety=ie? event.clientY : e.clientY
		tempx=parseInt(crossobj.style.left)
		tempy=parseInt(crossobj.style.top)
		dragapproved=true
		document.onmousemove=drag_drop
	}
}

document.onmousedown=initializedrag
document.onmouseup=new Function("dragapproved=false")

function showOverlay (obj)
{	
	if (document.readyState == 'complete') 
	{
		if (ie)
		{
			var overID = obj.ID + "_over";
			if (!document.getElementById(overID))
			{
				var elem = null;
				document.body.insertAdjacentHTML("beforeEnd", "<iframe id='" + overID + "' src='javascript:void(0)' + style='filter:progid:DXImageTransform.Microsoft.Alpha(style=0,opacity=0);position:absolute;left:0px;top:0x;z-index:500;display:none' scrolling='no' frameborder='0'></iframe>");
			}
			if (document.getElementById(overID))
			{
				var overs = document.getElementById(overID);
				overs.style.top = obj.style.top;
				overs.style.left = obj.style.left;
				overs.style.width = obj.offsetWidth;
				overs.style.height = obj.offsetHeight;
				
				overs.style.display = 'block';
			};
		};
	};
}
function hideOverlay(obj)
{
	if (ie)
	{
		var overID = obj.ID + "_over";
		if (document.getElementById(overID))
		{
			var overs = document.getElementById(overID).style;
			overs.display = 'none';
		};
	};
};