Select all when the Javascript page is not refreshed, and delete all (gridview)

/*
Select All */
Function sb002selectall ()
{
VaR table = Document. getelementbyid ("ctl00_maincontent_grvdevelopkit ");
For (VAR I = 1; I <Table. Rows. length; I ++)
{
VaR input = table. Rows [I]. cells [0]. getelementsbytagname ("input") [0];
Input. Checked =! This. checked;
}
}
/*
Release all
*/
Function sb002unselectall ()
{
VaR table = Document. getelementbyid ("ctl00_maincontent_grvdevelopkit ");
For (VAR I = 1; I <Table. Rows. length; I ++)
{
VaR input = table. Rows [I]. cells [0]. getelementsbytagname ("input") [0];
Input. Checked = This. checked;
}
}