function no_error(){ 
	return true; 
}
window.onerror=no_error;



function call() {					
	var units = document.form_t.nbre_t.value;
	var total = units * 5.5;
	document.form_t.howm.value='Total price: '+ total + ' Euro';
}

function change_div() {
	for (var i = 0; i < document.forms[0].elements.length; i++){
		var j = document.forms[0].elements[i];
		switch (j.type){
			case 'select-one':
			if (j.name == 'select' && j.selectedIndex == 1){
				document.getElementById('2').style.display = "block"; 
				document.getElementById('3').style.display = "none"; 
				document.getElementById('4').style.display = "none"; 
			} else if (j.name == 'select' && j.selectedIndex == 2){
				document.getElementById('2').style.display = "none"; 
				document.getElementById('3').style.display = "block"; 
				document.getElementById('4').style.display = "none"; 
			} else if (j.name == 'select' && j.selectedIndex == 3){
				document.getElementById('2').style.display = "none"; 
				document.getElementById('3').style.display = "none"; 
				document.getElementById('4').style.display = "block"; 
			}
		break;	
		}
	}
}