// 
if ((screen.width==800) && (screen.height==600)) //if 800x600 
document.getElementById('txtscroll').style.height = 8.0 + "cm"; 
else if ((screen.width==1024) && (screen.height==768)) //if 1024x768 
document.getElementById('txtscroll').style.height = 10.0 + "cm"; 
else if ((screen.width==1152) && (screen.height==864)) 
document.getElementById('txtscroll').style.height = 16.0 + "cm"; 
else if ((screen.width==1280) && (screen.height==720)) 
document.getElementById('txtscroll').style.height = 9.5 + "cm"; 
else if ((screen.width==1280) && (screen.height==768)) 
document.getElementById('txtscroll').style.height = 11.5 + "cm"; 
else if ((screen.width==1280) && (screen.height==960)) 
document.getElementById('txtscroll').style.height = 16.0 + "cm"; 
else if ((screen.width==1280) && (screen.height==1024)) 
document.getElementById('txtscroll').style.height = 18.0 + "cm"; 
else if ((screen.width>=1280) && (screen.height>=1024)) 
document.getElementById('txtscroll').style.height = 18.5 + "cm"; 
else
document.getElementById('txtscroll').style.height = 10.0 + "cm"; 
//