function clearText(thefield){
	if (thefield.defaultValue==thefield.value)
	thefield.value = ""
}

function checkContactform ( form )
{
    // ** START **
    if (form.name.value == "") {
        alert( "You forgot to enter your name." );
        form.name.focus();
        return false ;
    }
    if (form.company.value == "") {
        alert( "Please provide the name of your company" );
        form.company.focus();
        return false ;
    }
    if (form.email.value == "") {
        alert( "You forgot to enter your email address." );
        form.email.focus();
        return false ;
    }
    if (form.phone.value == "") {
        alert( "You forgot to enter your phone number." );
        form.phone.focus();
        return false ;
    }
    if (form.corelength.value == "") {
        alert( "Please indicate the required core length." );
        form.corelength.focus();
        return false ;
    }
    if (form.corewidth.value == "") {
        alert( "Please indicate the required core width." );
        form.corewidth.focus();
        return false ;
    }
    if (form.coreheight.value == "") {
        alert( "Please indicate the required core height." );
        form.coreheight.focus();
        return false ;
    }
    if (form.spacing.value == "") {
        alert( "Please indicate the required membrane spacing." );
        form.spacing.focus();
        return false ;
    }
    if (form.flowrate.value == "") {
        alert( "Please indicate the required flow rate" );
        form.flowrate.focus();
        return false ;
    }
    if (form.quantity.value == "") {
        alert( "Please indicate the quantity required." );
        form.quantity.focus();
        return false ;
    }
    if (form.delivery.value == "") {
        alert( "Please indicate when you require delivery." );
        form.delivery.focus();
        return false ;
    }
    // ** END **
        return true ;
}