ASP String Concatenation Problem

i have actually obtained some keywords from javascript and i have concatenated them in the form of:

function delete_check()
{
//alert("m inside the function") Testing Purpose
var count=<%=c%>
var str = ""
alert(count)
for (xx = 1; xx <= count; xx++)
{
if(document.getElementById(xx).checked == true)
{
vals=document.getElementById(xx).value;
str= str+"@" +vals
}
}
location.href="delete_demo_submit.asp?var="+str
}
</script>

this code basically opens up a new window names delete_demo_submit.asp and i have passed a concatenated string in the format " @fghfg@dfgdf@farhan19 " as a query string. now after recieving that concatenated string i have to split that keyword by split function wrt @ sign.

now the question is ... in asp is there any function that can calculate the number of "@" signs in the string so i can easily control the loop or any other alternative and effective technique?