function help(anchor) {
	window.open("ayuda.php#"+anchor,"Ayuda","resize=yes,scrollbars=auto,height=300,width=300");
}


function xor(a,b) {
	return ( a || b ) && !( a && b );
}
function myopen(url,title,args) {
	mywindow = window.open(url,title,args);
	mywindow.focus();
}
function hide(tag) {
	document.getElementById(tag).style.display="none";
}
function show(tag) {
	document.getElementById(tag).style.display="";
}
function toggle(tag) {
	if (document.getElementById(tag).style.display=="block" || document.getElementById(tag).style.display=="") {
		hide(tag);
		return "none";
	} else {
		show(tag);
		return "";
	}
}

function createCookie(name,value,days) {
	if (days) {
		var date = new Date();
		date.setTime(date.getTime()+(days*24*60*60*1000));
		var expires = "; expires="+date.toGMTString();
	}
	else var expires = "";
	document.cookie = name+"="+value+expires+"; path=/";
}

function readCookie(name) {
	var nameEQ = name + "=";
	var ca = document.cookie.split(';');
	for(var i=0;i < ca.length;i++) {
		var c = ca[i];
		while (c.charAt(0)==' ') c = c.substring(1,c.length);
		if (c.indexOf(nameEQ) == 0) return c.substring(nameEQ.length,c.length);
	}
	return null;
}

function eraseCookie(name) {
	createCookie(name,"",-1);
}
function validaCalificacion(input) {
 //alert(input.value);
	//var number=input.value;
	var pasa=true;

	var rnum =input.value;
	if (input.value == "") { //if 1



      pasa=false;
      newnumber = "";
   }//fin if 1
if(pasa==true){
    if (isNaN(input.value)) {//if 2
    input.value =0.0;

      input.focus();
      alert("solo es permitido ingresar numeros del 0.1 al 10.0 ");
      pasa=false;
       input.value =0.0;
    }// fin if 2
}
if(pasa==true){
	if (input.value>10.0) {//if 3
      input.value =10.0;
      input.focus();
      alert("solo es permitido ingresar numeros del 0.1 al 10.0 ");

      pasa=false;
      input.value =10.0;
    }//fin if 3
}
	if(pasa==true){
	var rlength = 1;
	if (rnum > 8191 && rnum < 10485) {//if 4
		rnum = rnum-5000;
		var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
		newnumber = newnumber+5000;
	} else {
		var newnumber = Math.round(rnum*Math.pow(10,rlength))/Math.pow(10,rlength);
	}///fin else del if 4

	input.value = newnumber;
	input.focus();
	//alert(input.value);
	}

}

function currencyFormat($number) {
	$number*=100;
	$number=Math.round($number);
	$number/=100;
	$number="$"+$number;
	return $number;
}

function isEmail(string) {
return (string.search(/^\w+((-\w+)|(\.\w+))*\@[A-Za-z0-9]+((\.|-)[A-Za-z0-9]+)*\.[A-Za-z0-9]+$/) != -1);
}