function stringClear( stringBadDangerous )
{
	//elimina contenido riesgoso en string
	var stringClear_x= stringBadDangerous ;
	stringClear_x 	 = stringClear_x.replace("<s","(s");
	stringClear_x 	 = stringClear_x.replace("<S","(S");
	stringClear_x 	 = stringClear_x.replace("/>","/)");
	stringClear_x 	 = stringClear_x.replace("&","y");
	stringClear_x 	 = stringClear_x.replace("select","selct");
	stringClear_x 	 = stringClear_x.replace("SELECT","selct");
	stringClear_x 	 = stringClear_x.replace("Select","selct");
	stringClear_x 	 = stringClear_x.replace("insert","insrt");
	stringClear_x 	 = stringClear_x.replace("INSERT","insrt");
	stringClear_x 	 = stringClear_x.replace("Insert","insrt");
	stringClear_x 	 = stringClear_x.replace("update","updat");
	stringClear_x 	 = stringClear_x.replace("UPDATE","updat");
	stringClear_x 	 = stringClear_x.replace("Update","updat");
	stringClear_x 	 = stringClear_x.replace("UpDate","updat");
	stringClear_x 	 = stringClear_x.replace("delete","delt");
	stringClear_x 	 = stringClear_x.replace("DELETE","delt");
	stringClear_x 	 = stringClear_x.replace("Delete","delt");
	stringClear_x 	 = stringClear_x.replace("drop","drp");
	stringClear_x 	 = stringClear_x.replace("DROP","drp");
	stringClear_x 	 = stringClear_x.replace("Drop","drp");
	stringClear_x 	 = stringClear_x.replace("shutdown","shtdwn");
	stringClear_x 	 = stringClear_x.replace("SHUTDOWN","shtdwn");
	stringClear_x 	 = stringClear_x.replace("Shutdown","shtdwn");
	stringClear_x 	 = stringClear_x.replace("--","");
	stringClear_x 	 = stringClear_x.replace("'","");
	return stringClear_x;
}