/*
 *	Fichero para la previsualizacion de las imagenes en una capa aparte.
 *
*/
var ie = document.all;
var ns6 = (document.getElementById && !document.all);
var crossobj;
var intCapaAbierta = 0;
var blnCapaTexto = false;

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

function enlarge(imagen, e, posicion, texto, textoCerrar,imgwidth, imgheight, objPupUp){
	var intDiferencia = 250;
	if(imagen==''){
		blnCapaTexto = true;
		document.onmousedown=initializedrag;
		document.onmouseup=new Function("dragapproved=false");
	}
	
	var blnLeft = true;
	if (ie||ns6){
		crossobj = document.getElementById ? document.getElementById(objPupUp) : eval("document.all." + objPupUp);
		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 if(posicion == "control")
		{
			var horzpos= -1;
			var intWidthMax = -1;
			
			if(ns6)
			{
				intWidthMax = (pageXOffset+e.clientX+imgwidth);
				//alert("ns6: " + intWidthMax + "-" + innerWidth);
				if(intWidthMax>innerWidth){
					horzpos = pageXOffset+e.clientX-imgwidth-15;
					horzpos += intDiferencia;
				}
				else{
					horzpos = e.clientX;	
				}
				//alert("horzpos: " + horzpos);
			}
			else
			{
				intWidthMax = (ietruebody().scrollLeft+event.clientX+imgwidth);
				//alert("other: " + intWidthMax + "-" + alertSize(true));
				if(intWidthMax>alertSize(true)){
					horzpos = ietruebody().scrollLeft+event.clientX-imgwidth-15;
					horzpos += intDiferencia;
				}
				else{
					horzpos = ietruebody().scrollLeft+event.clientX; //event.clientX;
				}
			}
						
			var vertpos=ns6 ? pageYOffset+e.clientY : ietruebody().scrollTop+event.clientY
		}
		else{
			var horzpos=ns6 ? pageXOffset+e.clientX : ietruebody().scrollLeft+event.clientX;
			var vertpos=ns6 ? pageYOffset+e.clientY : ietruebody().scrollTop+event.clientY;
		}
		
		// establezco el left o right
		crossobj.style.left = (horzpos - intDiferencia)+ "px";
		crossobj.style.top = vertpos + "px";
		
		if(imagen != ''){
			crossobj.innerHTML='<div align="right" id="PopUpBarraArrastre"><span id="textoCerrar" onClick="closepreview()">'+textoCerrar+'</span> </div><img src="'+imagen+'"><br><div align="center">' + texto + '</div>';
			crossobj.style.width = imgwidth;
		}else{
			if(intCapaAbierta == 0){
				crossobj.innerHTML='<div align="right" id="PopUpBarraArrastre"><span id="textoCerrar" onClick="closepreview()">'+textoCerrar+'</span></div>'+crossobj.innerHTML;
			}
			
			crossobj.style.width = imgwidth + 20;
		}
		intCapaAbierta = 1;
		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);
	if(overs && !blnCapaTexto){
		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" && !blnCapaTexto){
		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;
	}
}

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';
		}
	}
}

function alertSize(blnWidth) {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
	 //Non-IE
	 myWidth = window.innerWidth;
	 myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
	 //IE 6+ in 'standards compliant mode'
	 myWidth = document.documentElement.clientWidth;
	 myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
	 //IE 4 compatible
	 myWidth = document.body.clientWidth;
	 myHeight = document.body.clientHeight;
  }
  if(blnWidth) return myWidth;
  else return myHeight;
}