if (screen.width == '1024' && screen.height == '768')
{
 document.body.background="images/back10240768.jpg";
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if (screen.width == '1152' && screen.height == '864')
{
 document.body.background="images/back11520864.jpg";
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if (screen.width == '1280' && screen.height == '720')
{
 document.body.background="images/back12800720.jpg";
}

if (screen.width == '1280' && screen.height == '800')
{
 document.body.background="images/back12800800.jpg";
}

if (screen.width == '1280' && screen.height == '960')
{
 document.body.background="images/back12800960.jpg";
}

if (screen.width == '1280' && screen.height == '1024')
{
 document.body.background="images/back12801024.jpg";
}

if (screen.width == '1360' && screen.height == '768')
{
 document.body.background="images/back13600768.jpg";
}

if (screen.width == '1366' && screen.height == '768')
{
 document.body.background="images/back13660768.jpg";
}

if (screen.width == '1440' && screen.height == '900')
{
 document.body.background="images/back14400900.jpg";
}

if (screen.width == '1600' && screen.height == '900')
{
 document.body.background="images/back16000900.jpg";
}

if (screen.width == '1680' && screen.height == '1050')
{
 document.body.background="images/back16801050.jpg";
}

if (screen.width == '1920' && screen.height == '1080')
{
 document.body.background="images/back19201080.jpg";
}

if (screen.width == '1920' && screen.height == '1200')
{
 document.body.background="images/back19201200.jpg";
}