function checksize_mainblock()
{
if (document.body.offsetWidth < 1400)
{
for (ii=1; ii<=10; ii++)
eval ("document.getElementById('mainblock"+ii+"').style.width = '48%'");
}
if (document.body.offsetWidth > 1400 && document.body.offsetWidth < 1650)
{
for (ii=1; ii<=10; ii++)
eval ("document.getElementById('mainblock"+ii+"').style.width = '31%'");
}
if (document.body.offsetWidth > 1650)
{
for (ii=1; ii<=10; ii++)
eval ("document.getElementById('mainblock"+ii+"').style.width = '24%'");
}
}