var topSpace=194;
var botSpace=105;
function resizeDiv(){
    var isExist=null;
    try{
        var d=document.getElementById('maindiv');
       isExist=d;
    }catch(err){
        
        isExist=null;
    }
    if(isExist==null){
        
        return;
    }
    var w = 0;
    var h = 0;

    //IE
    if(!window.innerWidth)
    {
    //strict mode
    if(!(document.documentElement.clientWidth == 0))
    {
    w = document.documentElement.clientWidth;
    h = document.documentElement.clientHeight;
    }
    //quirks mode
    else
    {
    w = document.body.clientWidth;
    h = document.body.clientHeight;
    }
    }
    //w3c
    else
    {
    w = window.innerWidth;
    h = window.innerHeight;
    }
    var minH=0//topSpace+botSpace+250;
    if(h<minH){
     // alert(h+" < "+minH)
        return;
    }
   // alert(w+"x"+h)
    var newDivH=h-topSpace-botSpace
   // alert(newDivH);
    d.style.height=newDivH+"px";
}