var galto,alto;
var gancho;

function switchdiv(elem) 
{
  if (document.getElementById(elem).style.display=='block') 
  {
    document.getElementById(elem).style.display='none' 
  } 
  else 
  {
    document.getElementById(elem).style.display='block';
  }
}

function switchsoft(elem)
{
  if (document.getElementById(elem).style.display=='block') {
    alto=document.getElementById(elem).offsetHeight;
    galto=alto;
    gancho=document.getElementById(elem).offsetWidth;
    document.getElementById(elem).style.height=galto+"px";
    document.getElementById(elem).style.width=gancho+"px";
    document.getElementById(elem).style.top=galto+"px";
    document.getElementById(elem).style.left=gancho+"px";
    collapsesoft(elem,4);
  } else {
    galto=parseInt(document.getElementById(elem).style.top);
    alto=galto;
    gancho=parseInt(document.getElementById(elem).style.left);
    document.getElementById(elem).style.display='block';
    expandesoft(elem,4);
  }
}

function collapsesoft(elem,step) {
  var op;
  galto-=Math.round(step);
  document.getElementById(elem).style.height=Math.abs(galto)+"px";
  op=galto/alto;
  document.getElementById(elem).style.opacity=op; 

  if (galto<1) {
    document.getElementById(elem).style.display="none";
    return;
  }
  step=step*1.1;
  setTimeout(function(){collapsesoft(elem,step)},20);
}

function expandesoft(elem,step) {
  var palto,op;
  palto=parseInt(document.getElementById(elem).style.height);
  if (palto+Math.round(step)>galto) {
    document.getElementById(elem).style.height=galto+"px";
  document.getElementById(elem).style.opacity="1"; 
    return;
  }

  op=(palto/alto);
  //alert(op);
  document.getElementById(elem).style.opacity=op; 
  
  document.getElementById(elem).style.height=palto+Math.round(step)+"px";
  step=step*1.1;
  setTimeout(function(){expandesoft(elem,step)},20);
}

function  collapseall() {
  var cajasbox=document.getElementsByClassName('cajabox');
  if (cajasbox.length>0) {
    curstyle=cajasbox.item(0).style.display;
    if (curstyle=="block") {
      curstyle="none"; 
    }else {
      curstyle="block";
    }
  }
  for (var i = 0; i < cajasbox.length; i++) {
    cajasbox.item(i).style.display=curstyle;
  }
}

function edizor(insinicio,insfinal,textarea)
{
  var begin = textarea.value.substr(0, textarea.selectionStart);
  var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
  var end = textarea.value.substr(textarea.selectionEnd);
  textarea.value = begin + insinicio + selection + insfinal + end;

}

function edimagen(textarea)
{
  var url=window.prompt('Introduce el url de la imagen:');
  if (url)
  {
    var begin = textarea.value.substr(0, textarea.selectionStart);
    var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
    var end = textarea.value.substr(textarea.selectionEnd);
    textarea.value = begin + '<img src="'+url+'" alt="'+selection+'" />'+ end;
  }
}

function edilink(textarea)
{
  var url=window.prompt('Introduce la dirección del enlace:');
  if (url)
  {
    var begin = textarea.value.substr(0, textarea.selectionStart);
    var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
    var end = textarea.value.substr(textarea.selectionEnd);
    textarea.value = begin + '<a href="'+url+'">'+selection+'</a>'+ end;
  }
}

function edivota(textarea)
{
  var encuesta=window.prompt('Muestra los resultados de una encuesta.\nIntroduce el identificador de la encuesta:');
  if (encuesta)
  {
    var begin = textarea.value.substr(0, textarea.selectionStart);
    var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
    var end = textarea.value.substr(textarea.selectionEnd);
    textarea.value = begin + '[votacion]'+encuesta+'[/votacion]'+selection+ end;
  }
}

function ediencuesta(textarea)
{
  var encuesta=window.prompt('Inserta una encuesta.\nIntroduce el identificador de la encuesta:');
  if (encuesta)
  {
    var begin = textarea.value.substr(0, textarea.selectionStart);
    var selection = textarea.value.substr(textarea.selectionStart, textarea.selectionEnd - textarea.selectionStart);
    var end = textarea.value.substr(textarea.selectionEnd);
    textarea.value = begin + '[encuesta]'+encuesta+'[/encuesta]'+selection+ end;
  }
}

var getElementsByClassName = function (className, tag, elm){
	if (document.getElementsByClassName) {
		getElementsByClassName = function (className, tag, elm) {
			elm = elm || document;
			var elements = elm.getElementsByClassName(className),
				nodeName = (tag)? new RegExp("\\b" + tag + "\\b", "i") : null,
				returnElements = [],
				current;
			for(var i=0, il=elements.length; i<il; i+=1){
				current = elements[i];
				if(!nodeName || nodeName.test(current.nodeName)) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	else if (document.evaluate) {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = "",
				xhtmlNamespace = "http://www.w3.org/1999/xhtml",
				namespaceResolver = (document.documentElement.namespaceURI === xhtmlNamespace)? xhtmlNamespace : null,
				returnElements = [],
				elements,
				node;
			for(var j=0, jl=classes.length; j<jl; j+=1){
				classesToCheck += "[contains(concat(' ', @class, ' '), ' " + classes[j] + " ')]";
			}
			try	{
				elements = document.evaluate(".//" + tag + classesToCheck, elm, namespaceResolver, 0, null);
			}
			catch (e) {
				elements = document.evaluate(".//" + tag + classesToCheck, elm, null, 0, null);
			}
			while ((node = elements.iterateNext())) {
				returnElements.push(node);
			}
			return returnElements;
		};
	}
	else {
		getElementsByClassName = function (className, tag, elm) {
			tag = tag || "*";
			elm = elm || document;
			var classes = className.split(" "),
				classesToCheck = [],
				elements = (tag === "*" && elm.all)? elm.all : elm.getElementsByTagName(tag),
				current,
				returnElements = [],
				match;
			for(var k=0, kl=classes.length; k<kl; k+=1){
				classesToCheck.push(new RegExp("(^|\\s)" + classes[k] + "(\\s|$)"));
			}
			for(var l=0, ll=elements.length; l<ll; l+=1){
				current = elements[l];
				match = false;
				for(var m=0, ml=classesToCheck.length; m<ml; m+=1){
					match = classesToCheck[m].test(current.className);
					if (!match) {
						break;
					}
				}
				if (match) {
					returnElements.push(current);
				}
			}
			return returnElements;
		};
	}
	return getElementsByClassName(className, tag, elm);
};