Disable Fileds based on Option selected

I figured this one out...

I used the following script to disable 2 fields namely "Field1" and "Field2"
These 2 fields will get disabled if the "Name" field has the value IJP selected.

<script>

document.forms.editform.value_Name.onchange=function()

{

if(this.options[this.selectedIndex].value=='Existing')

document.forms.editform.value_Field1.disabled=false;

else

{

document.forms.editform.value_Field1.disabled=true;

document.forms.editform.value_Field1.value='';

}

{

if(this.options[this.selectedIndex].value=='Existing')

document.forms.editform.value_Field2.disabled=false;

else

{

document.forms.editform.value_Field2.disabled=true;

document.forms.editform.value_Field2.value='';

}

}

}

</script>