根据百分比设置宽度

   var grid_width; 
var grid_init=false; 

function caculate_grid_width_func(){ 


var tabPanel = $('#documentlist').closest('.tabs-panels'); 
if(tabPanel.length>0){ 
grid_width = tabPanel.width(); 
}else{ 
grid_width=$('#documentlist').width(); 
} 


} 

/**设置百分比*/ 
function count_width_func(columnWidth){ 
var result = 128; 
var diff = 0; 
columnWidth=null==columnWidth||''==columnWidth||'100%'==columnWidth?'128':columnWidth; 

if ( $.browser.msie ){ 
if('9.0'==$.browser.version ) 
diff=3; 
else if('8.0'==$.browser.version ) 
diff=3; 
else 
diff=6; 
} 
else if($.browser.chrome) 
diff=5; 
else 
diff=2; 

if(columnWidth.indexOf('%')>0){ 
columnWidth=columnWidth.replace('%','')*1; 
result=grid_width*columnWidth/100; 
} 
else if(columnWidth.indexOf('px')>0){ 
columnWidth=columnWidth.replace('px',''); 
result=columnWidth; 
} 
else 
result=columnWidth; 
return Math.ceil(result)-diff; 
}