How to process inverted comma in "EXECUTE 'insert into xxx values(...)'; "?

Look at this problem:
when
execute 'insert into lse_installations values(' || ''''||obj_id||'''' || ',' || ''''||div||'''' || ',' || ''''||sub||'''' || ',' || ''''||obj_type||'''' || ',' || ''''||obj_name||'''' || ',' || ''''||pstcd||'''' || ',' || ''''||rdcd||'''' || ',' || ''''||blkno||'''' || ',' || ''''||vldunt||'''' || ','|| cenlat || ',' || cenlon || ')';
because obj_name from another table has value like this:S'pore High Polymer.
Following error raises:
ERROR: syntax error at or near "pore"
SQL state: 42601
Context: PL/pgSQL function "lse_installations" line 64 at execute statement

So how to process the single inverted comma in char variable?It makes me so desperate.

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