function showhide1(){
document.getElementById('clients').style.display = 'block'; 
document.getElementById('personnel').style.display = 'none'; 
document.getElementById('waterjets').style.display = 'none'; 
}

function showhide2(){

document.getElementById('clients').style.display = 'none'; 
document.getElementById('personnel').style.display = 'block'; 
document.getElementById('waterjets').style.display = 'none'; 
}

function showhide3(){

document.getElementById('clients').style.display = 'none'; 
document.getElementById('personnel').style.display = 'none'; 
document.getElementById('waterjets').style.display = 'block'; 
}