// JavaScript Document

//Function to allow only numbers writen into a field.
function isitNum(field) {
	if (isNaN(field.value)) {
		for (i=0;i<field.value.length;i++) {
			if (isNaN(field.value.charAt(i))) {
				letra = field.value.charAt(i);
				field.value = field.value.replace(letra,"");
				i--;
			}
		}
	}
}
//Function to allow only secure character writen into a field
function isitOk(field) {
	especial_chars="\\!|\"#·$%&¬/()=?'¿¡><`[^*+]{}Ç´;:";
	for (i=0;i<field.value.length;i++) {
		if (especial_chars.indexOf(field.value.charAt(i)) != -1) {
			letra = field.value.charAt(i);
			field.value = field.value.replace(letra,"");
			i--;
		}
	}
}