Would you be better off using radio buttons instead of checkboxes as per this site: http://www.echoecho.com/htmlforms10.htm?
If you want to use check boxes I guess you could do something like this:
HTML Code:
<input type="checkbox" id="Check1" value="Value1" onclick="selectOnlyThis(this.id)" /> Option 1
<input type="checkbox" id="Check2" value="Value1" onclick="selectOnlyThis(this.id)" /> Option 2
<input type="checkbox" id="Check3" value="Value1" onclick="selectOnlyThis(this.id)" /> Option 3
<input type="checkbox" id="Check4" value="Value1" onclick="selectOnlyThis(this.id)" /> Option 4
Javascript Code :
function selectOnlyThis(id) {
for (var i = 1;i <= 4; i++)
{
document.getElementById("Check" + i).checked = false;
}
document.getElementById(id).checked = true;
}
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