function approachOn(approachSelected){ 
document.getElementById("approach").className=approachSelected; 
}
function productsOn(productsSelected){ 
document.getElementById("products").className=productsSelected; 
}
function clientsOn(clientsSelected){ 
document.getElementById("clients").className=clientsSelected; 
}
function companyOn(companySelected){ 
document.getElementById("company").className=companySelected; 
}
function servicesOn(servicesSelected){ 
document.getElementById("services").className=servicesSelected; 
}