function clear_input(e,value) {
if( e.value==value) e.value="";
else if( e.value.length==0 ) e.value=value;
}

function delete_confirm(url)
{
    var agree=confirm("Are you sure you wish to delete?");
    if (agree) window.location=url;
    else return false ;
}

function popup(url,width,height) 
{
    newwindow=window.open(url,'name','height='+height+',width='+width+',toolbar=no,menubar=no,scrollbars=yes,resizable=no');
    if (window.focus) {newwindow.focus()}
    return false;
}

function validate_form()
{

    if( document.getElementById('email') )
    {   
    var filter  = /^([a-zA-Z0-9_\.\-])+\@(([a-zA-Z0-9\-])+\.)+([a-zA-Z0-9]{2,4})+$/;
    var email = document.getElementById('email');
    var email_text = document.getElementById('email_text');
    var error1 = false;
        if(!filter.test(email.value))
        {   
            error1 = true;
            email_text.style.color="red";
        }   
        else
        {   
            error1 = false;
            email_text.style.color="#0091CB";
        }   
    }   

    if( document.getElementById('message') )
    {   
    var message = document.getElementById('message');
    var message_text = document.getElementById('message_text');
    var error2 = false;
        if( message.value.length<10 )
        {
            error2 = true;
            message_text.style.color="red";
        }
        else
        {
            error2 = false;
            message_text.style.color="#0091CB";
        }
    }

    if( !error1 && !error2 ) 
    {
        change_element_type('submit','submit');
    }

}