function btn_vlozit_in()
                {
                    eval('document.myform.btn_submit.className = "btn_odeslat_selected";')                    
                }
                function btn_vlozit_out()
                {
                    eval('document.myform.btn_submit.className = "btn_odeslat_normal";')
                }
                function btn_vlozit_in_fc()
                {
                    eval('document.myform.btn_submit.className = "btn_odeslat_selected_fc";')                    
                }
                function btn_vlozit_out_fc()
                {
                    eval('document.myform.btn_submit.className = "btn_odeslat_normal_fc";')
                }
                function checkform()
                {
                    if (document.myform.vzkaz_user_name.value=="" || 
                        document.myform.vzkaz_user_msg.value=="" ||
                        document.myform.check.value==""
                        ) 
                        {alert("Nevyplněny povinné údaje označené hvězdičkou (*)");return false;}
                    else
                        {return true;}
                }