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//sin permiitr espacios
var r={'special':/[\W]/g}
//con espacios
var s={'special':/[^\w^ñ^(á|é|í|ó|ú)^\s^]/g}

function valid(o,w){
o.value = o.value.replace(r[w],'');
}
function validaremos(o,w){
o.value = o.value.replace(s[w],'');
}


//agregamos al input
onkeyup="validaremos(this,'special')"