function Calc(el){
 var element = el.getElementsByTagName('div')[0];
 var bg = element.getElementsByTagName('div')[0];
 bg.style.height = element.offsetHeight+'px';
 }
 
 function Calc2(el){
 var element = el.getElementsByTagName('div')[7];
 var bg = element.getElementsByTagName('div')[0];
 bg.style.height = element.offsetHeight+'px';
 }