function alertSize() {
var myHeight = 0;
if( typeof( window.innerHeight ) == 'number' ) {myHeight = window.innerHeight;}
else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) )
{myHeight = document.documentElement.clientHeight;}
else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) )
{myHeight = document.body.clientHeight;}
myHeight = myHeight - 261;
document.getElementById("MainCol").style.minHeight=myHeight + "px";
}