function checkifempty(){
if (document.mainform.name.value!=''){
if (document.mainform.phonenumber.value!=''){
if (document.mainform.conferencetitle.value!='')
document.mainform.submitbutton.disabled=false
else
document.mainform.submitbutton.disabled=true
}
}
}

function checkifempty2(){
if (document.budget.name.value!=''){
if (document.budget.phonenumber.value!=''){
if (document.budget.conference.value!='')
document.budget.submitbutton.disabled=false
else
document.budget.submitbutton.disabled=true
}
}
}