function mySubmit() {
    if (document.formName.login.value == '') {
        alert('You must enter a value');
        return false;
    }
    else {
        alert('Submitting');
        return true;
    }
}



last_tab1 = 'tab1';
function show1(layerName) { 
document.getElementById(layerName).style.display = '';

} 

function hide1(layerName) { 
document.getElementById(layerName).style.display = 'none';
} 

function show_next1(tab_name) {
	
document.getElementById(last_tab1).className = 'tab';
var curr1 = document.getElementById(tab_name);
curr1.className='tab_hover';
hide1(last_tab1+'_data');
show1(tab_name+'_data');
last_tab1=tab_name;
}