function NumberText(e)
 {
if(window.event)
 {
if(e.keyCode<48   ||   e.keyCode>57||e.keyCode==8)
{
return false;
}
else
{
return true;
}
}
else if(e.which)
{
if((e.which>47)   &&   (e.which<58)||(e.which==8))
{
return true;
}
else 
{
return false;
}
}
}