function alertSize(id1, id2, id3) {
  
  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;
    myWidth_half = (Number(myWidth) / 2);
    myHeight = document.documentElement.clientHeight;
    myHeight_half = (Number(myHeight) / 2);
  } else if( document.body && ( document.body.clientWidth || document.body.clientHeight ) ) {
    //IE 4 compatible
    myWidth = document.body.clientWidth;
    myWidth_half = myWidth / 2;
    myHeight = document.body.clientHeight;
    myHeight_half = myHeight / 2;
  }
  function getPositionLeft(This){
	  var el = This;var pL = 0;
	  while(el){pL+=el.offsetLeft;el=el.offsetParent;}
	  return pL;
	  }
  function getPositionRight(This){
	  pR = This.offsetWidth;
	  return pR;
	  }
  function getPositionTop(This){
	  var el = This;var pT = 0;
	  while(el){pT+=el.offsetTop;el=el.offsetParent;}
	  return pT;
	  }
  function getPositionBottom(This){
	  pB = This.offsetHeight;
	  return pB;
	  }
  
  
  if (id1 == 'table_weiche'){
	  //checkBrowserName('MSIE');
	  pos_width_table_weiche = (myWidth - getPositionRight(document.getElementById("table_weiche"))) / 2 + "px"; 
	  pos_height_table_weiche = (myHeight - getPositionBottom(document.getElementById("table_weiche"))) / 2 + "px";
	  document.getElementById("table_weiche").style.marginTop = pos_height_table_weiche;
	  document.getElementById("table_weiche").style.marginLeft = pos_width_table_weiche;
  }else if (id1 == 'table_seitenzahl'){
	  //alert("button size: " + getPositionTop(document.getElementById("input_fragebogen")));
	  if (myHeight > getPositionTop(document.getElementById("input_fragebogen"))){
		  pos_width_seitenzahl = (myWidth - (getPositionRight(document.getElementById("table_seitenzahl"))+getPositionLeft(document.getElementById("table_seitenzahl"))+30)) + "px"; 
		  pos_height_seitenzahl = (myHeight - (getPositionBottom(document.getElementById("table_seitenzahl")) +  getPositionBottom(document.getElementById("table_seitenzahl"))+ getPositionTop(document.getElementById("input_fragebogen"))+10)) + "px";
		  document.getElementById("table_seitenzahl").style.position='absolute';
		  document.getElementById("table_seitenzahl").style.right = 10 + 'px';
		  document.getElementById("table_seitenzahl").style.bottom = 10 + 'px';
	  }else if (myHeight < getPositionTop(document.getElementById("input_fragebogen"))){
		  //alert("test");
		  pos_width_seitenzahl = (myWidth - (getPositionRight(document.getElementById("table_seitenzahl"))+getPositionLeft(document.getElementById("table_seitenzahl"))+30)) + "px"; 
		  document.getElementById("table_seitenzahl").style.MarginTop = 10 + 'px';
		  document.getElementById("table_seitenzahl").style.marginLeft = pos_width_seitenzahl;
	  }
	  
  }
 
}