public function downloadName($name) {
 
 $exp = explode(' ', $name);
 $imp = implode('_', $exp);
 return strtolower($imp) ;
 }

/**
 * Devuelve la cadena introducida en codigo
 * HTML correspondiete.
 * Usada para filtrar tildes y otros caracteres.
 *
 * @return string
 * @author MadPitbull 
 */
 
 public function replaceTildes ($cadena){
 $cadena = htmlentities($cadena, ENT_QUOTES | ENT_IGNORE, "UTF-8");
 return $cadena;
 }

/**
 * Devuelve la cadena introducida en codigoH TML correspondiente - version antigua -.
 * 
 * @return string
 * @author MadPitbull
 */
 function replaceTildesOld($cadena){
 $cadena = ereg_replace("á", "á", $cadena);
 $cadena = ereg_replace("é", "é", $cadena);
 $cadena = ereg_replace("í", "í", $cadena);
 $cadena = ereg_replace("ó", "ó", $cadena);
 $cadena = ereg_replace("ú", "ú", $cadena);
 $cadena = ereg_replace("Á", "Á", $cadena);
 $cadena = ereg_replace("É", "É", $cadena);
 $cadena = ereg_replace("Í", "Í", $cadena);
 $cadena = ereg_replace("Ó", "Ó", $cadena);
 $cadena = ereg_replace("Ú", "Ú", $cadena);
 $cadena = ereg_replace("Ñ", "Ñ", $cadena);
 $cadena = ereg_replace("ñ", "ñ", $cadena);
 
 return $cadena;
 }

function toFriendlyUrl($buff = false){
		if(!$buff) $buff = $this->data;
 
		/* Nulls */
		for($c = 0; $c <= 255; $c++){
			$replaces[$c] = '';
		}
 
		/* Numerics */
		for($c = 48; $c <= 57; $c++){
			$replaces[$c] = chr($c);
		}
 
		/* Upper chars */
		for($c = 65; $c <= 90; $c++){
			$replaces[$c] = chr($c);
		}
 
		/* Lower chars */
		for($c = 97; $c <= 122; $c++){
			$replaces[$c] = chr($c);
		}
 
		/* '"`´ */
		$replaces[34] = '.';
		$replaces[39] = '.';
		$replaces[44] = '.';
		$replaces[96] = '.';
 
		/* Simbols */
		$replaces[32] = '_'; /* Blank space */
		$replaces[40] = '_';
		$replaces[41] = '_';
		$replaces[43] = '_';
		$replaces[45] = '-';
		$replaces[46] = '.';
		$replaces[47] = '_';
		$replaces[58] = '_';
		$replaces[59] = '_';
		$replaces[61] = '-';
		$replaces[91] = '-';
		$replaces[92] = '_';
		$replaces[93] = '-';
		$replaces[95] = '_';
		$replaces[123] = '-';
		$replaces[124] = '-';
		$replaces[125] = '-';
		$replaces[126] = '-';
		$replaces[128] = 'e';
		$replaces[130] = '_';
		$replaces[131] = 'f';
		$replaces[132] = '_';
		$replaces[133] = '_';
		$replaces[138] = 's';
		$replaces[139] = '-';
		$replaces[140] = 'ce';
		$replaces[142] = 'z';
		$replaces[149] = '.';
		$replaces[150] = '-';
		$replaces[151] = '-';
		$replaces[152] = '-';
		$replaces[153] = 'tm';
		$replaces[154] = 's';
		$replaces[155] = '-';
		$replaces[152] = 'oe';
		$replaces[158] = 'z';
		$replaces[159] = 'y';
		$replaces[160] = '_';
		$replaces[162] = 'c';
		$replaces[163] = 'f';
		$replaces[164] = '.';
		$replaces[165] = 'y';
		$replaces[166] = '-';
		$replaces[167] = 's';
		$replaces[169] = 'c';
		$replaces[170] = 'a';
		$replaces[174] = 'r';
		$replaces[175] = '-';
		$replaces[176] = '.';
		$replaces[178] = '2';
		$replaces[179] = '3';
		$replaces[181] = 'u';
		$replaces[182] = 'p';
		$replaces[183] = '.';
		$replaces[184] = '_';
		$replaces[185] = 'i';
		$replaces[186] = 'o';
		$replaces[188] = '14';
		$replaces[189] = '12';
		$replaces[190] = '34';
		$replaces[192] = 'A';
		$replaces[193] = 'A';
		$replaces[194] = 'A';
		$replaces[195] = 'A';
		$replaces[196] = 'A';
		$replaces[197] = 'A';
		$replaces[198] = 'AE';
		$replaces[199] = 'C';
		$replaces[200] = 'E';
		$replaces[201] = 'E';
		$replaces[202] = 'E';
		$replaces[203] = 'E';
		$replaces[204] = 'I';
		$replaces[205] = 'I';
		$replaces[206] = 'I';
		$replaces[207] = 'I';
		$replaces[208] = 'D';
		$replaces[209] = 'N';
		$replaces[210] = 'O';
		$replaces[211] = 'O';
		$replaces[212] = 'O';
		$replaces[213] = 'O';
		$replaces[214] = 'O';
		$replaces[215] = 'X';
		$replaces[216] = 'O';
		$replaces[217] = 'U';
		$replaces[218] = 'U';
		$replaces[219] = 'U';
		$replaces[220] = 'U';
		$replaces[221] = 'Y';
		$replaces[222] = 'p';
		$replaces[223] = 'b';
		$replaces[224] = 'a';
		$replaces[225] = 'a';
		$replaces[226] = 'a';
		$replaces[227] = 'a';
		$replaces[228] = 'a';
		$replaces[229] = 'a';
		$replaces[230] = 'ae';
		$replaces[231] = 'c';
		$replaces[232] = 'e';
		$replaces[233] = 'e';
		$replaces[234] = 'e';
		$replaces[235] = 'e';
		$replaces[236] = 'i';
		$replaces[237] = 'i';
		$replaces[238] = 'i';
		$replaces[239] = 'i';
		$replaces[240] = 'o';
		$replaces[241] = 'n';
		$replaces[242] = 'o';
		$replaces[243] = 'o';
		$replaces[244] = 'o';
		$replaces[245] = 'o';
		$replaces[246] = 'o';
		$replaces[248] = 'o';
		$replaces[249] = 'u';
		$replaces[250] = 'u';
		$replaces[251] = 'u';
		$replaces[252] = 'u';
		$replaces[253] = 'y';
		$replaces[254] = 'p';
		$replaces[255] = 'y';
 
		for($c = 0; $c <= 255; $c++){
			$replaces_to[$c] = chr($c);
		}
 
		$return = preg_replace("@[^A-Za-z0-9\-_.]+@i", '', str_replace($replaces_to, $replaces, $buff));
 
		/* Repeat simbols */
		foreach(array('-', '_', '.') as $replace){
			if(str_replace(str_repeat($replace, 2), '', $return) != $return){
				$tofilter = explode(str_repeat($replace, 2), $return);
				foreach($tofilter as $filter){
					$return = str_replace(str_repeat($replace, 2), $replace, $return);
				}
			}
		}
 
		return $return;
	}