Remove / Hide Sharepoint list toolbar Item (delete item)

Open Sharepoint List new/edit/display form in sharepoint designer and put following code.

<script type="text/javascript">

var aList=document.getElementsByTagName("a");

for(i=0;i<aList.length;i++)

{

if(aList[i].innerHTML=="Delete Item")

{

aList[i].parentElement.parentElement.style.display="none";

}

}

</script>