//function to allow more than one window.onload event
function addLoadEvent(func) {
  var oldonload = window.onload;
  if (typeof window.onload != 'function') {
    window.onload = func;
  } else {
    window.onload = function() {
      oldonload();
      func();
    }
  }
}

function retSize(retSize) {
  var myWidth = 0, myHeight = 0;
  if( typeof( window.innerWidth ) == 'number' ) {
    //Non-IE
    myWidth = window.innerWidth;
    myHeight = window.innerHeight;
  } else if( document.documentElement && ( document.documentElement.clientWidth || document.documentElement.clientHeight ) ) {
    //IE 6+ in 'standards compliant mode'
    myWidth = document.documentElement.clientWidth;
    myHeight = document.documentElement.clientHeight;
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myHeight = document.body.clientHeight;
  }
  if(retSize=="width"){
	  //window.alert( 'Width = ' + myWidth );
	  return myWidth;
  }else{
	  //window.alert( 'Height = ' + myHeight );
	  return myHeight;
  }  
  
}

function PositionMiddle(){	
	var PageHeight = retSize("height");
	var wrap_all = document.getElementById("wrap_all");
	var wrap_content = document.getElementById("wrap_content");	

	if(PageHeight > 550){
		
	
	if(PageHeight && wrap_all && wrap_content){
		subtract = wrap_content.offsetHeight;
		PageHeightXtra = PageHeight - subtract;
		wrap_all.style.height=PageHeightXtra+'px';
		//alert();
	}
	}else{
		wrap_all.style.height='550px';
		wrap_content.style.top='0%';
	}
}


addLoadEvent(PositionMiddle);