How to disable mouse left click on the page.

Question

Hi

Can anybody help me to disable mouse left click on the page. actually i want to disable mouse left click, so that any body can't copy any content from my site.

Here i am using following code.

<script language="javascript">
function noLeftClick()
{
if (event.button==1)
{
//alert('Not allowed')
a;
}
}
document.onmousedown=noLeftClick
</script>

This is fine, But how to disable Ctrl+A to select the content.