Hiding the context menu Options/Items

Add the Content Editor web part, add below code to it.(remove items which you want to see!!)

<script type="text/javascript">

function CAMOpt(p,wzText,wzAct,wzISrc,wzIAlt,wzISeq,wzDesc)
{
var mo=CMOpt(wzText,wzAct,wzISrc,wzIAlt,wzISeq,wzDesc);
if(!mo)return null;
if(wzText != "View Properties")
if(wzText != "Edit Properties")
if(wzText != "Manage Permissions")
if(wzText != "Edit Document")
if(wzText != "Delete")
if(wzText != "Send To")
if(wzText != "Check Out")
if(wzText != "Version History")
if(wzText != "View Workflow History")
if(wzText != "Schedule Workflows")
if(wzText != "Alert Me")
AChld(p,mo);
return mo;

}
</script>