/* Función que carga anticipadamente las imagenes */
function loadImages()
{
	if (document.getElementById) { /* DOM3 = IE5, NS6 */
		$('hidepage').setStyle({'display' : 'none', 'visibility' : 'hidden'});
	}
	else {
		if (document.layers) { /* Netscape 4 */
			$('hidepage').setStyle({'display' : 'none', 'visibility' : 'hidden'});
		}
		else { /* IE 4 */
			$('hidepage').setStyle({'display' : 'none', 'visibility' : 'hidden'});
		}
	}
}

/* LTrim(string) : Returns a copy of a string without leading spaces. */
function ltrim(str)
{
   var whitespace = new String(" \t\n\r");
   var s = new String(str);
   if (whitespace.indexOf(s.charAt(0)) != -1) {
      var j=0, i = s.length;
      while (j < i && whitespace.indexOf(s.charAt(j)) != -1)
         j++;
      s = s.substring(j, i);
   }
   return s;
}

/* RTrim(string) : Returns a copy of a string without trailing spaces. */
function rtrim(str)
{
   var whitespace = new String(" \t\n\r");
   var s = new String(str);
   if (whitespace.indexOf(s.charAt(s.length-1)) != -1) {
      var i = s.length - 1;
      while (i >= 0 && whitespace.indexOf(s.charAt(i)) != -1)
         i--;
      s = s.substring(0, i+1);
   }
   return s;
}

/* Trim(string) : Returns a copy of a string without leading or trailing spaces */
function trim(str) {
   return rtrim(ltrim(str));
}

/* Función que abre una ventana emergente */
var win = null;
function popup(pagina,titulo,w,h){
	LeftPosition = (screen.width) ? (screen.width-w)/2 : 0;
	TopPosition = (screen.height) ? (screen.height-h)/2 : 0;
	estilo ='height='+h+',width='+w+',top='+TopPosition+',left='+LeftPosition+',menubar=no,scrollbars=yes,toolbar=no,location=no,directories=no,resizable=no';
	win = window.open(pagina,titulo,estilo)
}

/* Función que cambia la cantidad de resultados de páginas */
function change_respage( url ) {
    loadMainContent(url);
}

/* Función que cambia el tamaño de la fuente */
function changeSize(clase, size)
{
	$(clase).className = 'size-' + size;
	switch(size)
	{
		case 1:
			$('size-1').style.fontWeight = "bold";
			$('size-2').style.fontWeight = "normal";
		break;
		case 2:
			$('size-2').style.fontWeight = "bold";
			$('size-1').style.fontWeight = "normal";
		break;
	}
}

/* Cambiar */
var nav = window.Event ? true : false; //objeto en el que se definen los events del objeto window

/************* Funciones para validar la entrada por teclado *******************/
/* 
    Retroceso	: 	8
	Enter 		: 	13
	Espacio 	: 	32
    Suprimir	: 	46
    Cursores    :   37 - 40
    '/'		    : 	47
	'@'		    :	64
	'-'		    :	45
	'_'		    :	95
	','         :   44
    '.'         : 	46
    0..9        : 	48 a 57
	
	'A'..'Z'	: 	65 a 90
	'a'..'z'	: 	97 a 122
	ñ			: 	241
	Ñ			: 	209
	
	Caracteres	: 	123 a 255
	Caracteres	: 	192 a 255 (grado)
	
	Ctrl+C		: 	99
	Ctrl+V		: 	118
	
*/
function validate_number(event){
    var key = event.charCode ? event.charCode : event.keyCode;
    return (key <= 13 || (key > 34 && key < 47) || (key >= 48 && key <= 57)); 
}
function validate_text(event) {
    var key = event.charCode ? event.charCode : event.keyCode;
    return (key <= 13 || key == 32 || (key > 34 && key < 47) || (key >= 65 && key <= 96) || (key >= 97 && key <= 122)|| key == 241 || key == 209 || key >= 192) ;
}
function validate_id(event) {
    var key = event.charCode ? event.charCode : event.keyCode;
    return (key <= 13 || (key > 34 && key < 47) || key==95 || (key >= 65 && key <= 90) || (key >= 97 && key <= 122) || (key >= 48 && key <= 57)); 
}
function validate_text_number(event) {
	return (validate_number(event) || validate_text(event));
}
function validate_email(event){
	var key = event.charCode ? event.charCode : event.keyCode;
	return (key <= 13 || (key > 34 && key < 47) || key==95 || (key >= 48 && key <= 57) || (key >= 65 && key <= 90) || (key >= 97 && key <= 122) || key == 64); 
}

/* ContactUs */
function validate_contactus ( frm, url, urltogo) {
    msg = '';
    if ($F('userid') == '0') {
        $('userid').focus();
        msg += '\t- Destinatario no seleccionado\n';
        $('userid').className = 'requiredfield';
    } else {
        $('userid').className = 'field';
    }
    if (trim($F('name')) == '') {
        if (trim(msg) == '') {
            $('name').focus();
        }
        msg += '\t- Nombre no introducido\n';
        $('name').className = 'requiredfield';
    } else {
        $('name').className = 'field';
    }
    if (trim($F('email')) == '') {
        if (trim(msg) == '') {
            $('email').focus();
        }
        msg += '\t- Correo electrónico no introducido\n';
        $('email').className = 'requiredfield';
    } else {
        $('email').className = 'field';
    }
    if (trim($F('occupation')) == '') {
        if (trim(msg) == '') {
            $('occupation').focus();
        }
        msg += '\t- Ocupación no introducido\n';
        $('occupation').className = 'requiredfield';
    } else {
        $('occupation').className = 'field';
    }
    if (trim($F('message')) == '') {
        if (trim(msg) == '') {
            $('message').focus();
        }
        msg += '\t- Mensaje no introducido\n';
        $('message').className = 'requiredfield';
    } else {
        $('message').className = 'field';
    }
    
    if (trim(msg) == '') {
        sendForm(url, urltogo, $(frm).serialize());
    } else {
        alert('Los campos siguientes son erróneos:\n' + msg);
    }
}